Mendota M27 Installation And Operating Instructions Manual

85-03-01120-C M27

Installation and Operating Instructions

MODEL NO. M27 OPEN HEARTH DIRECT VENT GAS FIREPLACE HEATER

WARNING: If the information in these instructions

is not followed exactly, a fire or explosion may
result causing property damage, personal injury or

AVERTISSEMENT. Assurez-vous de bien suivre les

instructions données dans cette notice pour réduire au
minimum le risque d'incendie ou d'explosion ou pour

- Do not store or use gasoline or other flammable

vapors and liquids in the vicinity of this or any other
appliance.

- WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not

use any phone in your building.

• Immediately call your gas supplier from a

neighbor’s phone. Follow the gas supplier’s

instructions.

• If you cannot reach your gas supplier, call
the fire department.

- Installation and service must be performed by a
qualified installer, service agency or the gas
supplier.

Ne pas entreposer ni utiliser d'essence ni d'autres vapeurs

ou liquids inflammables dans le voisinage de cet appareil
ou de tout autre appareil.

- QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:

• Ne pas tenter d'allumer d'appareil.

• Ne touchez à aucun interrupteur. Ne pas vous servir des

téléphones se trouvant dans le bâtiment où vous trouvez.

• Appelez immédiatement votre fournisseur de gaz depuis

un voisin. Suivez les instructions du fournisseur.

• Si vous ne pouvez rejoindre le fournisseur de gaz,

appelez le service des incendies.

- L'installation et l'entretien doivent être assurés par un
installateur ou un service d'entretien qualifié ou par le
fournisseur de gaz.

This appliance may be installed in an aftermarket,

permanently located, manufactured home (USA
only) or mobile home, where not prohibited by local
codes.
This appliance is only for use with the type of gas
indicated on the rating plate. This appliance is not
convertible for use with other gasses, unless a

certified kit is used.

Cet appareil peut être installé dans une maison

préfabriquée (É.-U. seulement) ou mobile déjà installée à
demeure si les règlements locaux le permettent.
Cet appareil doit être utilisé uniquement avec les types de
gaz indiqués sur la plaque signalétique. Une trousse de
conversion est fournie avec cet appareil.

A barrier designed to reduce the risk of burns from

the hot viewing glass is provided with this appliance

and must be installed.

Une barrière conçue pour réduire le risque de brûlures

du verre chaud est fournie avec cet appareil et doit être

installée.

85-03-01120 M27 Page 2

HOMEOWNER NOTES

85-03-01120 M27 Page 2

READ ME FIRST

1.1 CAUTION STATEMENTS TO PARENTS OF YOUNG CHILDREN

If th is fireplace is installed in an isolated bedroom, study o r oth er room, always operate this appliance
in thermostatic temperature -contro ll ed mod e. Do not operate in Manual mode. Doing so can lead to
very high room temperatures which can be hazard ous t o th e roo m o ccu pants’ health.

Do not place young children in cribs, bassinets or the like in th e vicinity o f t his appliance. Young
child ren may be vulnerable to high temperatures that this fireplace can c reate loca lly.

Young children should be carefu lly supervised and never left unatt end ed when they are in the same
room as the fireplace. Toddlers, young children and others may be susceptible to accidental contact
burns. A physical barrier is recommended if there are at risk indi viduals in the house. To res trict access
to a fireplace or stove, install an adjustable safety gate to keep toddlers, young children and oth er at ­risk individuals out of the room and away from hot sur fa ces. Th is physical barrier is in addition to the
required glass barrier Screen.

1.2 INITIAL FIRING AND CURING PROCEDURE

This product requires an initial heat curing cycle during which some materials used in the manufacturing process will burn
off and the powder paint goes through a hardening cycle. During the initial curing phase, some smoke and odor will be
emitted. This is normal.
The installer should perform these initial curing cycle procedures as the final step in the installation process before
finishing materials are installed around this fireplace. See chapter 3.1.1 Mendota Fireplace Curing Instructions. Read and
follow all instructions given in this Chapter and perform the 3-step curing cycle.
After the 3-step curing cycle has been completed, all smoking will have stopped. Some slight odors may remain. With
subsequent use of this Fireplace, odors will slowly dissipate and disappear.

ODOR RISKS

If th is appliance is not operated for an extended period ( three months or longer), when first fired
again, exp ect odors of burnt dust and lint; just like when turning on your home heating system for the
fir st time in the Fall.

1.3 HOT SURFACES ARE NORMAL

Be aware that the surface in front of, above and adjacent to this heater appliance can be too hot to touch. As long as all
required clearances to combustibles are met and the required finishing materials are used, this appliance will perform
safely. Note that the exposed surfaces immediately surrounding the Fireplace can have surface temperatures that are too
hot to touch. This level of surface temperature is considered normal and does not indicate any hazardous situation.

WARNING: The supplied barrier screen must be installed always when this fireplace is in operation.
Do not place any object directly in front (within 60”) or d irectly above (on the front edge of the
mantel). This is a heating appliance. Areas directly in front and abo ve this appliance will be very hot
and can damage most household objects if placed too close. Keep Furniture pieces at least 60” away
in front of the barrier screen.

Periodic and annual cleaning are required

See Required Periodic Inspections, Chapter 6.1 and Required Annual Maintenance, Chapter 6.3. Periodic and Annual
cleaning and general services are required at least once a year in the Summer or early Fall. Cleaning pilot thermocouple,
thermopile, sparker rod and pilot hood body is required at least once per year. Cleaning of burner ports, gas orifice areas
is required once a year due to insects’ nesting probability due to Mercaptan addition in Natural Gas (Mercaptan has been
known to attracts insects).

Table of Contents

1.1 CAUTION STATEMENTS TO PARENTS OF YOUNG CHILDREN 3

1.2 INITIAL FIRING AND CURING PROCEDURE ..................... 3

1.3 HOT SURFACES ARE NORMAL ................................... 3

2.1 SAFETY AND WARNING INFORMATION .............. 6

2.2 SAFETY WARNINGS ................................................ 7

2.3 REQUIREMENTS FOR THE COMMONWEALTH OF MASS. . 10

3.1 GENERAL TECHNICAL REFERENCES ........................... 11

3.2 MECHANICAL TECHNICAL REFERENCES ...................... 13

3.2.12.5.1Paint Types Approved for Use ......................................... 28

3.2.12.5.2Sealants Type Approved for Use...................................... 28

3.2.12.5.3Wood Application Cautions ............................................. 28

3.2.15.3.1 Mendota Cool Wall ....... Error! Bookmark not defined.

3.2.15.3.2 Versiheat ....... Error! Bookmark not defined.

3.2.15.3.3 FlexHeat ....... Error! Bookmark not defined.

3.3 ELECTRICAL TECHNICAL REFERENCES ........................ 39

3.4 PLUMBING TECHNICAL REFERENCES ......................... 41

4.1 INSTALLATION CHECKLIST ...................................... 45

4.2 UNPACKING THE FIREPLACE ................................... 46

4.3 CONTENTS OF THE MANUAL PACKET ........................ 47

4.4 ITEMS PACKAGED INSIDE FIREBOX ............................ 47

4.5 WHAT IS NOT INCLUDED WITH THIS APPLIANCE? ......... 47

4.6 UNBOLTING FIREPLACE FROM PALLET ....................... 48

4.8 TO REMOVE DOOR .............................................. 49

4.10 TO REPLACE DOOR .............................................. 50

4.11 FIREBOX REFRACTORY LINER REMOVAL AND INSTALLATION

PROCEDURES ................................................. 51

4.12 NATURAL GAS TO LPG CONVERSION ........................ 53

4.13 VENTING ........................................................... 57

4.14 M27 LOG SET INSTALLATION INSTRUCTIONS ................ 67

4.15 M-27 ASHTON SURROUND KIT INSTALLATION .. 76

4.16 LIGHTING CHECKLIST ............................................ 84

4.17 AIR SHUTTER CONTROL AND FLAME APPEARANCE ....... 85

5.1 AESTHETIC CONSIDERATIONS .................................. 86

5.2 HEATING PERFORMANCE ....................................... 86

5.3 IMPORTANT INFORMATION FOR HOMEOWNER ............ 86

5.4 FIRST TIME LIGHTING INSTRUCTIONS ........................ 87

5.5 TO TURN OFF GAS TO FIREPLACE ............................. 88

5.6 FREQUENTLY ASKED QUESTIONS ...................... 89

6.1 REQUIRED PERIODIC INSPECTIONS ........................... 92

6.2 CLEANING VIEWING GLASS .................................... 92

6.3 REQUIRED ANNUAL MAINTENANCE ......................... 92

6.4 OVER FIRING OR UNDER FIRING OF BURNER .............. 93

6.5 PILOT OUTAGE AND RE-LIGHTING ........................ 93

6.6 COMBUSTION SYSTEM MILLIVOLT READINGS ... 93

6.7 BURNER FLAME HEIGHTS REFERENCE DIAGRAM ......... 94

8.1 INSTALLER VERIFICATION CHECKLIST ... ERROR! BOOKMARK

NOT DEFINED.

8.2 WARRANTY POLICY STATEMENT ..ERROR! BOOKMARK NOT

DEFINED.

85-03-01120 M27 Page 6

GENERAL INFORMATION

2.1 SAFETY AND WARNING INFORMATION

Building Permit & Inspection Requirements

All installations of Mendota Fireplaces must comply with all the requirements stated in this Installation and Operating Manual.
The dealer and/or installer must obtain all required building permits and inspection approvals from the local building inspection
department or the local jurisdiction. To validate warranty coverage, Mendota may require facsimile copies of the building
permit and inspection approval forms. Failure to provide adequate proof that the installation conforms to all local requirements
and the requirements stated in the Installation and User Manual will void all applicable warranties.

Other Cautions

CAUTION: Each installation must conform to all local, state and nati onal codes. Refer to the national fuel

gas code and local zoning and code authorities for detai ls on installation requirements. The Mendot a
Fir epl ace must be vented to the out sid e in ac cord ance with the latest edition of the National Fuel Gas Code.
In the absence of local codes, the installation must con for m to the mo st current edition of the National Fuel
Gas Code ANSI Z223.1, also known as NFPA 54.

CAUTION: The Mendota Fireplace may be installed in a manufactured (mobil e) home aft er the first sale of
the home. Manufactured home (mobile home) in st allat ion must conform with the Manufactured Ho me
Construction and Safety Standard, Title 24 CFR, Part 3280, or, when su c h a standard is not applicable, the
Standard for Manufactured Home Installations, ANSI A225.1/N FPA 501A , or CSA Z240.4 -Gas Equipp ed Mobile
Housing. Consult your local building official. NOTE: For mobile home installations, unit must be bolt ed to
the Manufactured home floor and properly grounded.

INSTALLER: Leave this manual with the app lian ce. CONSUMER: Retain this manual for future reference.
INSTALLATEUR : Laissez cette notice avec l’appar eil. CONSOMMATEUR : Conservez cette notice pour

consultation ultérieure.

85-03-01120 M27 Page 7

2.2 SAFETY WARNINGS

HIGH-ALTITUDE INSTALLATION INFORMATION: Prior to installing at altitudes higher than 7,500 ft., understand the need for gas

input derating. Contact your local gas company to see if your gas type is already derated for your altitude or contact Mendota
Technical Service for support.
INSTALLER NOTE: These instructions are to remain with homeowner.
Be sure to read and understand all instructions carefully before starting the fireplace. Failure to follow these instructions may
result in a possible fire hazard leading to property loss, injury or even death and will void all warranty.

FOR YOUR SAFETY: A qualified installer, service agency, or
the gas supplier must perform installation and service.
Do not store or use gasoline or other flammable vapors
and liquids in the vicinity of this or any other appliance.
WARNING: Do not operate this appliance with the glass
removed, cracked or broken. A licensed or qualified
person should do replacement of glass.

AVERTISSEMENT: Ne pas utiliser l’appareil si le panneau
frontal en verre n’est pas en place, est craqué ou brisé.
Confiez le remplacement du panneau à un technicien
agréé.
WARNING: Mendota gas fireplaces are heat producing
appliances. Do not burn wood, paper or other materials in

this fireplace. This fireplace is designed as a supplemental

heat source. It is advisable to have an alternative primary
heat supply.

WARNING: Improper installation, adjustment,

alteration, service or maintenance can cause injury or
property damage. Refer to this manual. For
assistance or additional information consult a

qualified installer, service agency or the gas supplier.

In the Commonwealth of Massachusetts:

Installation must be performed by a licensed plumber or
gas fitter; a CO detector shall be installed in the room
where the appliance is installed.

This appliance may be installed in an aftermarket,

permanently located, manufactured (mobile) home
(USA Only), where not prohibited by local codes.
This appliance is only for use with the type(s) of gas
indicated on the rating plate. This appliance is not
convertible for use with other gases, unless a certified
conversion kit is used.
Cet appareil peut être installé dans un maison
préfabriquée (mobile) déjà installée à demeure si les
règlements locaux le permettent.

Cet appareil doit être utilisé uniquement avec les types

de gas indiqués sur la plaque signalétique. Ne pas
l’utiliser avec d’autres gas sauf si un kitde conversion
certifié est installé.

85-03-01120 M27 Page 8

Safety Standards and Warnings

Do not operate this appliance with the glass removed, cracked or broken. Only glass doors certified with this
appliance shall be used.

A barrier designed to reduce the risk of burns from the hot viewing glass is provided with this appliance and
must be installed. If the barrier beco mes damaged, the barrier shall be replaced with the manufacturer's
barrier for this appliance.

Any Barrier Screen or guard removed for ser vicing must be replaced before operating fireplace.

Tout écran ou protecteur retiré pour permettre l’entret ien de l’appareil doit être remis en place avant de
mettre l’appareil en marche.

This un it is not for use with solid fuel.
Ne pas utiliser avec du combustible solide.
Insta lla tion and repair should be performed by a qualified service person. The fireplace and venting system

shoul d be inspected before initial use and at least annually by a professional service person. Mo re frequent
cleaning may be required due to excessive lint fro m carp etin g, bedding, material, etc. It is imperative that
the unit’s control compartment, burners and c ircu lating air passageways are kept clean to provide for
adequate combustion and ventilati on air.

L’installation et la réparation devrait être confiées à un technicien qualifié. L’appareil devrait faire l’objet
d’une inspection par un technicien professionnel a vant d’ êt re u tilisé et au moins une fois l’an par la suite.

Des nettoyages plus fréquent s p eu vent être nécessai res si l es tapis, la literie, et cetera produisent une
quantité importante de poussière. Il est essentiel que les c omp artiments abritant les commandes, les
brûleurs et les conduits de circulation d’air de l’appareil soient tenu s propres.

Always keep the fireplace clear and free from combustib le materials, gasoline, and other flammable vapors
and liquids.

Never obstruct the flow of combustion an d ventilation air. Keep the front of the fireplace clear of all
obstacles and materials for servicing and proper operation. Use only Mendota approved Screens, Fronts and
Tr im Kits.

Due to high temperature, the fireplace should be located out of traffic are as and away fro m furnitu re and
draperies. En raison des températures élevées, l’a ppareil devrait être installé dans un endroit où il y a peu
de circulation et loin du mobilier et des tentures.

Cloth ing or flammable material should not be placed on or n ear th e firep lac e.
On ne devrait pas placer de vêtements ni d’autres matières inflammables sur l’appareil ni à proximité.
Chil dren and adults should be alerted to the hazards of high surface temperature and should stay away to

avo id burns or clothing ignition. The door glass, surrounding walls and obj ects can be too hot to touch.
Les enfants et les adultes devraient être in formés des dangers que posent les températur es de surface

élevées et se tenir à distance afin d’éviter des brûlures ou que l eur s vêtements n e s’en flamment.
Young children should be carefu lly supervised when they are in th e sam e room as the fireplace. Tod dlers,

young children and others may be susceptible to a ccidenta l c ontact burns. A physical barrier is
recommended if there are at risk individuals in the hou se. To r est rict access to a fireplace or stove, install
an adjustable safety gate to keep toddler s, youn g children and other at -risk individuals out of the ro om and
away fro m hot surfaces. This physical barrier i s in addition to the required glass barrier Screen .

Les jeunes enfants devraient être surveillés étroitement lorsq u’ils se trouvent dans la même pièce que

l’appareil. Les tout petits, les jeunes enfants ou les adu ltes peuvent subir des brûlures s’ils viennent en
contact avec la surface chaude. Il est recomman dé d’installer une barrière physique si des personnes à

risques habitent la maison. Pour empêcher l’accès à un foyer ou à un po êle, installez une barrière de
sécurité; cette mesure empêchera les tout petits, les jeun es enfan ts et toute autre personne à risque
d’avo ir accès à la pièce et aux surfaces chaudes.

Th ese units must use one of the vent systems desc ribed in th e Flu e Venting section of this manual.

85-03-01120 M27 Page 9

This gas fireplace and vent system must be vented directly to the outsid e and must never be attached to a
chimney serving a separate solid fuel -burning fireplace. Each gas fireplace must use a separate vent sy stem.
Common vent systems are prohibited .

Th e ven t sy stem for this fireplace must be periodically exa min ed by a qualified service agenc y to maintain
venting performance and safety . If the vent-air intake system is disassembled for any reason, reinstall per
the in st ructions provided for the initial installatio n.

Inspect the external vent cap on regular basis (monthly) to mak e sure that no debris is interfering with the
airflow. The flow of combustion and ventilation air are n ot to be obstructed.

Do not abuse the glass door assembly by striking the glass, slamming th e d oor shut, etc.
Use only authorized parts and materials obtained from Mendota Hearth when replacing defective or

damaged glass, log sets, media, firebox inner liners or trim kit s.
Do not use abrasive cleaners on the glass door a ssemb ly. Do not attempt to cle an the glass door wh en it is

hot. Use Mendota recommended cleaner, Kel Kem.
Turn off the gas before servicing this fireplace. It is reco mmend ed t hat a qualified service technician

perform a fireplace check-up at the b eginning of each heating season.
Do not place furniture or any other combustible h ousehold objects within 60” of the fireplace front, per fire

sa fety cod e.
This vented gas fireplace heater is not for use with air filter s.
Foyer au gaz à évacuation. - Ne pas utiliser avec du combustible solide.
Keep burner and control compartment clean. See insta llat ion and operating instructions accompanyi ng

fir eplace.
S'a ssurer que le brûleur et le compartiment des command es sont pr opres. Voir les instructions d'installation

et d 'utilisation qui accompagnent l' appareil.
WARNING: Improper installation, adjustm ent, alt eration, service or maintenance can cause injury or

property damage. Refer to the owner’s informatio n manua l provided with this fireplace. For assistance or

additional information consult a qualified installer, service agency or th e gas supplier.
L'A VERTISSEMENT: L'installation inconvenante, ajustement, modification, service ou entretien peut causer

le do mmages de propriété ou blessure. Référer au manu el d 'in fo rmation de propriétaire fourni cet appare il.
Pour l'assistance ou information supplémentaire consulte un qualifiée installeur, agence de service ou le
fourn isseur de gaz.

Do not use this fireplace if any part has been und er water. Immediately call a qualified service technician to
insp ect the fireplace and to replace any part of the control system and any gas control, which ha s b een
underwater.

Ne pas utiliser cet appareil s’il a été plongé, même partiellement, dans l’eau. Appeler un technicien qualifié
pour inspecter l’appareil et remplacer toute partie du système de commande et toute commande qui a été
plongée dans l’eau.

Do not use any fronts or doors with this fireplac e unless they are certified by Mendota and installed by a
certified installer.

Seu les d es portes certifiées pour cet appareil d oivent être utilisées.

85-03-01120 M27 Page 10

2.3 REQUIREMENTS FOR THE COMMONWEALTH OF MASS.

The information in this section applies to all installations performed in the Common Wealth of Massachusetts only.

a. For all side wall, horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole

or in part for residential purposes and where the side wall exhaust vent termination is less than seven (7) feet above
grade, the following requirements shall be satisfied:

1. If there is no carbon monoxide detector with an alarm already installed in compliance with the most current

edition of NFPA 720, NFPA 70 and the Massachusetts State Building code in the residential unit served by the
side wall horizontally vented gas fueled equipment, a battery-operated carbon monoxide detector with an
alarm shall be installed in compliance with the most current edition of NFPA 720. NFPA 70 and the
Massachusetts State Building Code.

2. In addition to the above requirements, if there is not one already present, a carbon monoxide detector with an

alarm and a battery backup shall be installed and located in accordance with the installation requirements
supplied with the detector on the floor level where the gas equipment is installed. The carbon monoxide
detector with an alarm shall comply with 527 CMR, ANSI/UL 2034 Standards or CSA 6.19 and the most current
edition of NFPA 720. In the event that the requirements of this subdivision cannot be met at the time of the
completion of the installation of the equipment, the installer shall have a period of thirty (30) days to comply
with this requirement; provided, however, that during said thirty (30) day period, a battery-operated carbon
monoxide detector with an alarm shall be installed in compliance with the most current edition of NFPA 720,
NFPA 70 and the Massachusetts State Building Code. In the event that the horizontally vented gas fueled
equipment is installed in a crawl space or an attic, the carbon monoxide detector may be installed on the next
adjacent habitable floor level. Such detector may be a battery-operated carbon monoxide detector with an
alarm and shall be installed in compliance with the most current edition of NFPA 720, NFPA 70 and the
Massachusetts State Building Code.

3. A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a

minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally
vented gas fueled heating appliance or equipment. The sign shall read, in print size no less than one-half (1/2)”
in size, “GAS VENT DIRECTLY BELOW, KEEP CLEAR OF ALL OBSTRUCTIONS”

4. A final inspection by the state or local gas inspector of the side wall horizontally vented equipment shall not be

performed until proof is provided that the state or local electrical inspector having jurisdiction has granted a
permit for installation of carbon monoxide detectors and alarms as required above.

b. EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2) (a) 1 through 4:

1. The equipment listed in Chapter 10 entitled “Equipment Not Required To Be Vented” in the most current

edition of NFPA 54 as adopted by the Board; and

2. Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure separate

from the dwelling, building or structure used in whole or in part for residential purposes.

c. When the manufacturer of Product Approved side wall horizontally vented gas equipment provides a venting system

design or venting system components with the equipment, the instructions for installation of the equipment and the
venting system shall include:

1. A complete parts list for the venting system design or venting system; and

2. Detailed instructions for the installation of the venting system design or the venting system components.

d. When the manufacturer of a Product Approved side wall horizontally vented gas fueled equipment does not provide the

parts for venting the flue gases, but identifies “special venting systems”, the following shall be satisfied:

1. The referenced “special venting system” instructions shall be included with the appliance or equipment

installation instructions; and

2. The “special venting systems” shall be Product Approved by the Board, and the instructions for that system shall

include a parts list and detailed installation instructions.

e. A copy of all installation instructions for all Product Approved side wall horizontally vented gas fueled equipment, all

venting instructions, all parts lists for venting instructions, and/or all venting design instructions shall remain with the
appliance or equipment at the completion of the installation

85-03-01120 M27 Page 11

TECHNICAL REFERENCES

Read and understand all information provided under this section, Technical References, before you begin the installation of this
product. Failure to follow all technical reference information, use of components or parts not approved or use of improper
installation procedures can lead to a fire or explosion causing property damage, personal injury or loss of life.

3.1 GENERAL TECHNICAL REFERENCES

Caution: Before igniting the pilot or burners, perform the following insp ecti ons and verifications:

Check glass gasket seal. Visually inspect glass gasket, especially at the corners of the glass piece. Glass gasket is installed as a 4­piece assembly. Check joints between the gasket pieces at the corners. They should butt against each other to create a seal.
Gaps between gasket pieces can cause exhaust leaks and lead to acrid smell concerns. Check for gas leaks at all fittings.

During the first burning cycle of this Fireplace, ensure the convection blower is running at level three during the first two hours
of initial burn. After two hours of initial burn, allow fireplace to cool. Proceed with Mendota Fireplace Curing Instructions,

Chapter 3.1.1.

This fireplace must be installed and serviced by a qualified installer, service agency, or the gas supplier. Any adjustments to
burner, pilot, logs or coal bed must be made by a qualified installer, service agency, or the gas supplier.
If the ignition control system goes into lockout mode, always wait 5 minutes before attempting to relight.
Never block off convection air openings or paths. Trim panels or surrounds shall not seal ventilation openings in the fireplace.
Always use Mendota decorative fronts and Mendota approved vent systems and vent caps only.

Keep the flue warm

It is required to leave the pilot light running during winter months when outside daily high temperatures remain 50oF or lower.
Doing so will eliminate heat loss from the home through the Fireplace glass door and will increase flue draft during startups and
will aid in eliminating system lock out.

WARNING

FIRE RISK/ODOR RISK

• This fireplace must be installed on top of wood, masonry or metal floor extending the full width and depth of this

fireplace.

• An R-1 Rated Hearth Protection Pad, 18” deep, is required unless this fireplace is elevated at least 6” above floor

level of the room. For every 1” this fireplace is elevated, you may reduce the hearth pad depth by 2”. Locate and

install appliance to all clearance specifications in manual.

• Verify glass gasket seal before firing unit the first time. Verify proper latching of glass frame onto unit body.

• Understand that this appliance requires a break-in period during which small amounts of smoke and curing smells

will be emitted.

85-03-01120 M27 Page 12

Mendota Fireplace Curing Instructions

ATTENTION

It is important that the blowers are turned on during this step to prevent the curing smoke from stai ning th e
wal l fini sh ab ove the fireplace. Mendota recommends completing Step 1 pr ior to install ation of wall finish
mat erials.

Visib le smoke and strong odor ar e to be ex pected during this step. If desired, disable smok e alarms befor e
this step, smoke from the initial curing c ycle will set off smoke alarm s. Open doors and windows of the ho me
to circulate fresh air.

Step 1: Expelling Initial Smoke and Odors

• Please refer to Error! Reference source not found., Chapter Error! Reference source not found., if you have questions on

how to operate your Mendota.

• Complete the installation of any barrier screen (required), surround, front or doors.

• Turn the fireplace on in the Manual (Off) thermostat mode.

• Set the Flame Height to Hi.

• Set the Fan Speed Control to Level 3.

• Run the fireplace with these settings for a minimum of 2 hours.

• Turn the fireplace off and let it cool.

Step 2: High Heat Curing Cycle

• Turn the fireplace on in the Manual (Off) thermostat mode.

• Set the Flame Height to Hi.

• Set the Fan Speed Control to Off.

• Run the fireplace with these settings until curing odors have diminished, about 3 hours.

• When odors have diminished leave the fireplace turned on and continue to Step 3.

Step 3: Final Curing Cycle

• With the fireplace still turned on from Step 2.

• Set the Fan Speed Control to the lowest setting Level 1.

• If any new curing odors are detected, continue to run the fireplace with this setting until the curing odors have

diminished.

ATTENTION: Slight odors may still be noticeable on future startups of the fireplace. These will diminish over time as the

fireplace is used.

Additional Curing Information

It is not unusual for a fireplace to require more than 10 continuous hours on high for curing odors to diminish. There are
variables that can extend or shorten the curing time such as decorative fronts, doors, facing materials and their application.
Finish materials around the fireplace are subject to high temperatures. Finishing materials used over the fireplace in the non­combustible zone can see temperatures around 350° F. Materials used around the fireplace must be rated for these
temperatures. Failure to use adequate materials can result in odor problems. Please refer to Suitable Mantel, Facing & Hearth

Pad Materials, Chapter 0 of this manual for information on appropriate finishing materials.

Please be aware that materials used around the fireplace will heat up and have the potential to cause odor issues. Adhesives,
glue, wall substrate, wall finish material, paints and polishes are common materials that if used incorrectly will cause odor
issues. Mendota is not responsible for any odor issues caused by materials used around the fireplace.

85-03-01120 M27 Page 13

3.2 MECHANICAL TECHNICAL REFERENCES

Planning the installation

This Mendota Fireplace must be installed and serviced by a qualified installer, service agency, or the gas supplier.

When planning on appliance installation, it is necessary to determine the following information before installing:

• Where the appliance is to be installed.

• The vent system configuration to be used.

• Gas supply piping.

• Electrical Wiring.

• Framing and finishing details.

• Hearth Protection Pad Requirements.

• Whether accessories such as a ceiling fan are desired.

Selecting Appliance Location

When selecting a location for your appliance, it is important to consider the required clearances to walls.

WARNING

FIRE RISK- ODOR RISK

• Install appliance on metal or wood surfaces extending full width and depth of this fireplace.

• An R-1 Rated Hearth Protection Pad [1-1/2” Thick Maximum] is required unless this fireplace is elevated. For

every 1” this fireplace is elevated, you may reduce the hearth pad depth by 2”. If this fireplace is elevated 6”
or higher no hearth protection pad is required.

• Do NOT install this fireplace directly on carpeting, vinyl or any combustible material other than wood.
Construct chase to all clearance specifications in manual.

• Locate and install appliance to all clearance specifications in manual.

85-03-01120 M27 Page 14

Listing Label

The listing label is located behind the right side hinged surround leg.. It is secured to a chain and left loosely in the air gap and
can be pulled out to be viewed.

Figure 3-1 Listing Label

85-03-01120 M27 Page 15

Other Warning and Caution Labels

A few warnings and caution labels are attached to this appliance body and door glass as required per code to inform you of
important facts. Make certain you heed all the warning and caution statements during installation and maintenance of this
appliance.

Figure 3-2

Figure 3-3

Figure 3-4

Figure 3-5

Figure 3-6

85-03-01120 M27 Page 16

Figure 3-8

Figure 3-7

85-03-01120 M27 Page 17

M27 Fireplace Ratings Information

This Mendota Fireplace can be installed directly on top of a metal, masonry or wood structural surface.

ELECTRICAL REQUIREMENTS: 120 Volts AC, 1.5 Amps (minimum line voltage allowed 110 Volts AC) REQUIRED
GAS SUPPLY PRESSURE: NAT. GAS: 7" W.C. [5.0" W.C. MIN., 11" W.C. MAX.]

L.P. GAS: 11" W.C. [11" W.C. MIN., 13" W.C. MAX.]

LP GAS CONVERSION KIT: This Fireplace comes configured for use with Natural Gas. To convert the Fireplace for use with LP
Gas, install: LP GAS CONVERSION KIT #HA-48-00025.
GAS INPUT RATES High Fire Low Fire

BTUH. (MODEL M-27) NAT. GAS 27,000 6,750
BTUH. (MODEL M-27) LP GAS 25,000 7,000

ORIFICE SIZES………… [0-2000ft (610 m)]: REAR BURNER: #45 NG [#56 L.P.] – FRONT BURNER: #51 NG [#59 LP]

[2000-4500ft (610-1370 m)]: REAR BURNER: #46 NG [#57 L.P.] – FRONT BURNER: #52NG [#60 LP]

P.4 FIREPLACE EFFICIENCY ..........70.0%

FLUE VENTING ............COAXIAL RIGID- 4” DIAMETER EXHAUST & 6-5/8” DIAMETER AIR INLET AND APPROVED VENT CAPS

All UL Listed Coaxial Rigid 4”X6-5/8” Vent pipe components and vent caps are approved for use. Do not mix components of
different brands or series. Always use the same brand and series components throughout the entire vent system.

MINIMUM CLEARANCES TO COMBUSTIBLE CONSTRUCTION

UNIT TO FLOOR 0in. (0mm) GLASS EDGE TO ADJACENT SIDEWALL 12 in. (305 mm)
UNIT TO ENCLOSURE SIDEWALL 0 in. (0 mm) VENT PIPE TOP TO COMBUSTIBLES 3in. (51mm)
UNIT TO ENCLOSURE BACK WALL 1 in. (25 mm) VENT PIPE SIDES TO COMBUSTIBLES 1in. (25mm)
UNIT TOP TO ENCLOSURE CEILING 1-1/2 in. (41 mm) VENT PIPE BOTTOM TO COMBUSTIBLES 1in. (25mm)
UNIT BOTTOM TO ROOM CEILING 60in. (152.4 cm)
DISTANCE TO 8” MANTLE ABOVE TOP CONVECTION AIR DISCHARGE OPENING 13 in. (330 mm)

MINIMUM COMBUSTIBLE ROUGH FRAMING DIMENSIONS

WIDTH = 29-1/2” (74.9 cm) HEIGHT = 49” (124.6 cm) DEPTH = 19-1/2” (35.6 cm)

NET WEIGHT................175 lbs. (Team Lift recommended)

BARRIER SCREEN: A barrier screen that has been certified for use with this Fireplace must be installed on the Fireplace when it

is in use. The barrier screen will prevent accidental contact with the glass door face, which could result in a severe burn.

SAFETY: AGA certified, electronic ignition IPI system activated with thermostatic remote control.
CERTIFIED TO: ANSI Z21.88-2016

This Mendota Gas Fireplace has been tested and certified by:
Intertek Testing Services, 8431 Murphy Drive, Middleton, WI 53562\

ICBO#AA647-4

85-03-01120 M27 Page 18

Normal Surface Temperatures

WARNING: The supplied barrier screen must be installed, always, when this fireplace is in operation. Do
not plac e any object directly in front (within 60” from barrier screen surface) or directly above (on the
front edge of the mantel). This is a heat ing appliance. Areas directly in front and above this appliance will
be very hot and can damage most hou sehold objects if placed too close. Keep Furniture piece s at least
60” away in front of the barrier screen surface.

HINT: To greatly reduce surface temperatures surr ounding th is Fireplace during operation, Mendota
recommends operating the integrated convection air blowers which aid in cooling all surrounding surfaces.

Mendota Fireplaces comply with ANSI Z21.88-2016 Standards for maximum surface temperatures (ambient plus 117oF) on
exposed “combustible” surfaces adjacent to the Fireplace.

Be aware that surfaces in front of, above and adjacent to this heater appliance can be too hot to touch. As long as all required
clearances to combustibles are met and the required finishing materials are used, this appliance will perform safely. Note that
the exposed surfaces immediately surrounding the Fireplace can have surface temperatures that are too hot to touch. This level
of surface temperature is considered normal and does not indicate any hazardous situation.

Hearth Pad Temperatures

New hearth protection pads installed are required to
have a thermal insulation value of R-1.
The top exposed surface of the noncombustible hearth
pads can reach a temperature that is too hot to touch
(as high as 250oF). This is considered normal.

Surround Face Temperatures

Areas of the breastplate directly above the top
convection air gap of this Fireplace can be very hot (too
hot to touch (exceeding 250oF)) and is deemed normal.

Mantel Temperatures

Mendota Fireplaces comply with ANSI Z21.88-2016
standards for maximum surface temperatures on
exposed “combustible” surfaces adjacent to the
Fireplace. Be aware that surface in front of, above and
adjacent to this heater appliance can be too hot to
touch. As long as all required clearances to
combustibles are met and the required finishing
materials are used, this appliance will perform safely.
Note that the exposed surfaces immediately
surrounding the Fireplace can have a surface
temperature too hot to touch. This level of surface temperatures is considered normal and does not indicate any hazardous
situation.

WARNING: Surfaces surrounding this Fireplace can be very hot to the touch during operation. Carefully supervise children and
pets while this Fireplace is operating.

Figure 3-9 Hot Zones

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Fireplace Dimensions and Clearances

Figure 3-10 Overall Fireplace Dimensions

85-03-01120 M27 Page 20

Rough Framing Dimensions

The Rough Framing Height must be maintained to allow this fireplace and the 90-degree elbow connected directly to the top,
on certain vent systems, to slide into the framing cavity. Once the fireplace is positioned inside the framed cavity, a secondary
nailer stud should be added at a minimum height of 38 inches above the floor level of this fireplace. The nailer stud will allow
for securing facing materials.

Special consideration for vertical

vent systems

If a straight-up vertical vent system is being
considered, the top plate on the front wall of the
chase will need to be notched to allow the proper

1” clearance from the top plate to the vertical

vent pipe. Furthermore, all framing headers and

members that are located within the 1” clearance

requirement to the vent stack or vent components must be positioned on edge (on the 1-1/2” edge) to allow proper clearance
to the vent stack or component.

Figure 3-11 FRAMING METHOD

Figure 3-12 VERTICAL VENT SPECIAL REQUIREMENT

Minimum Rough Framing Dimensions

DESCRIPTION

DIMENSION (INCHES)

A

Width

29-1/2

B

Height

49”

C

Depth

14”

D

Unit Base to Room Ceiling

60”

E

Unit Base to 8” Mantel

47”

85-03-01120 M27 Page 21

Constructing the Appliance Chase

A chase is a vertical box-like structure built to enclose this fireplace and its vent system. Vertical vents that run on the outside
of a building may be, but are not required to be, installed inside a chase.
Construction of the chase may vary with the type of building. These instructions are not substitutes for the requirements of
local building codes. Local building codes MUST be adhered to.
Chases should be constructed in the manner of all outside walls of the home to prevent cold air drafting problems. The chase
should not break the outside building envelope in any manner.
Wall, ceiling, base plate and cantilever floor of the chase should be insulated. Vapor and air infiltration barriers should be
installed in the chase as per regional codes for the rest of the home. Additionally, in regions where cold air infiltration may be
an issue, the inside surfaces of the chase may be sheet rocked and taped for maximum air tightness.
To further prevent drafts, the fire stops should be caulked with high temperature caulk to seal the gaps. Gas line holes and
other openings should be caulked with high temp caulk or stuffed with unfaced insulation. If the appliance is being installed on
a cement slab, a layer of plywood may be placed underneath this fireplace to prevent conducting cold up into the room

ELEVATED FRAMING DIMENSIONS

This fireplace may be installed in an elevated position by created an elevated deck and an appropriate framed enclosure.
NOTE : This fireplace may be elevated but MUS T allow a minimum of 60” distance between this fireplace’s

floo r level and the ceiling.

Figure 3-13 ELEVATED FRAMING DIMENSIONS

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Clearance from Appliance Outer Surfaces

Figure 3-14 CLEARANCES TO APPLIANCE BODY

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Clearances to Combustible Side Walls

The minimum distance required from the side edge of the visible glass to a combustible side wall is 12”. Combustible side walls,
mantel corbels, mantel legs and other combustible walls and decorative objects must fall behind a 45-degree line extending
outward from the side edges of the visible glass unless such objects are more than 12” away from the visible side edges of the
glass.

If the required clearance cannot be met to a pre-existing co mbu st ible side wall, an NFPA appro ved clearance
redu ction shield, metal or ceramic boa rd, must be added to the side wall.

Horizontal Clearance Reduction by 66%

NPFA 211 Approved: Install 20-gauge or heavier

steel shield that provides at least a 1” active
airspace, on the combustible wall surface. To

provide for active airflow, install at least 1” metal

or ceramic standoffs or spacers between the metal
shield and the combustible surface being
protected. The bottom and top edges of the cavity
between the metal shield and the combustible
surface must be left open. The steel shield must be
a minimum of 12” larger in each direction than the
surface area of the source of heat; or if the surface
being protected is smaller than surface area of the
source of heat, this shield must be larger than the
combustible surface in each direction.
By using this method of protection, if the required
horizontal clearance was 16”, the resulting
clearance will be reduced by 66% to 5-3/8”
between the heat source and the metal shield.

Horizontal Clearance Reduction by 50%

NPFA 211 Approved: Install an R-1 rated ceramic board or R-1 rated mineral board on the wall you are attempting to protect.

by using this method of protection, if the required horizontal clearance was 16”, the resulting clearance will be reduced by 50%
to 8” between the heat source and the R-1 Rated wall board.

Figure 3-15 CLEARNCES TO SIDE WALLS

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Clearances to Combustible Mantels

An 8” combustible mantel may be installed at a minimum of 13" above the top of the heat outlet (47” up from the floor level of
this Fireplace). Non-combustible (marble, brick, stone, metal etc.) mantels can be installed at any desired height above the top
convection air opening. Any pre-existing combustible mantel must fall within the approved mantel profile chart.

WARNING: Make proper use of this chart. Do not compromise the specifications contained in this chart.
Failure to adhere to proper clearances required to combustibles may cause spontaneous combustion of the mantel and may
result in a fire causing property damage, personal injury or loss of life.

NOTE: For mantels that protrude more than 8 inches from the front surface of the fireplace use a rise and run of (1:1) to
calculate the required height to the mantel. EXAMPLE: You have a 12" mantel. To calculate the height above the
convection air opening the equation would be: 12" x (1/1) + 13" = 25" above the convection air opening. DO NOT deviate
from this minimum clearance requirement. Doing so can lead to a severe fire hazard.

Note: The distance from the Floor Level of this Fireplace to the Top Air Gap is 34”.

Figure 3-16 Mantel Clearances

85-03-01120 M27 Page 25

Hearth Pad Requirement

A non-combustible hearth protector with a thermal insulation rating of R-1 is required when installing this fireplace directly on
the floor and must extend a minimum of 12" in front of this fireplace.

For every 1” the fireplace is raised off the floor, th e d epth o f th e required hearth protector may b e r educed
by 2”. If fireplace is raised off the floor 6" or more, no hearth pr otector is required for fire protectio n.

Caution: The fireplace creates localized heat and causes thermal expan sion of adjacently installed flooring
and wall materials. Vinyl floor s and floating Engineered wood floors may warp if installed in front of this
unit even when this fireplace is raised 6” or more due to local heating up of the floor mat erial s. Never use
viny l or Engineered wood flooring in the hearth pad area in front of th is fireplace unless you plan to r aise
this unit 12” or more above the floor level.

Caution: Modern carpets use polypropylene, nylon or polyester fibers in the upper visible layer. These fibers
when exposed to radiant heat can curl and stiffen. It is not p ossible to prevent radiation effects to the
carpet fibers even when this unit is raised high. A void in stallin g carpets in the hearth pad area in front of
this Fireplace unless this fireplace is raised at least 12 inch es above the carpet level .

Hearth Pad Guide [Usage and Removal]

This fireplace is shipped with a Hearth Pad spacer Installed. The purpose of the Hearth Pad Spacer is to allow room for the basic
decorative front required for each of these units. DO NOT build a Hearth pad that is more than 1-1/4” thick. Doing so will not
allow installation of decorative fronts on this fireplace.

NOTE : This fireplace may be elevated but MUST all ow a minimum of 60” distance between th is fireplace’s
floo r level and the ceiling of the room.

Figure 3-17HEARTH PAD GUIDE

85-03-01120 M27 Page 26

Suitable Mantel, Facing & Hearth Pad Materials

Use of ceramic glazed tiles as facing materials around a Mendota Fireplace is approved. Use caution when selecting tile
adhesives. Avoid premixed tile adhesives which contain products that can off gas for long periods when exposed to heat. Use
Portland cement based unmixed tile adhesives or RTV Silicone to attach ceramic glazed tiles as facing in hot areas around this
Fireplace. If using RTV silicone, allow a minimum 48 hours cure time for the silicone to cure before firing this Fireplace after tile
application.

Marble, Granite and Natural Stones

Marble, granite and other natural stone products are approved for use as mantel, facing and hearth pad materials with the
following limitations and understanding of these cautionary statements:

Never use a one-piece marble, granite or n atural stone that is water jet or mechanically cut in a U -shape
as fac ing material to cover the sides and top areas around th is product. Doing so can lead to crack
formation at the inner corners of the U sha pe due to thermal e xpansion.

Figure 3-18 Three Piece Stone

Most marble slabs and marble tiles contain a polyester resin coating while most granite slabs and granite tiles contain epoxy
resin coatings. The polyester resin coatings and the epoxy resin coatings provide structural strength to the stone slabs and
prevent cracking, chipping and breakage during shipping and handling. These coatings also provide a glossy or satin surface
finish and help seal the stone surface.

Th e poly ester resin used on marble slabs can discolor when expo sed to temperatures greater than 150oF
and will structurally fail at temperatures above 230oF. The epoxy resin coating used on granite slab s are
resistant to discoloring and structural failures up to 350oF.Mendota does not assume any liab ili ty fo r
discoloring, flaking or cracking of marble or granite.

Temperatures on facings around Mendota Gas Fireplaces can reach 350oF
directly outside the top convection air gap and as high as 210oF at the
maximum allowed mantel protrusion level above the top convection air gap.
These temperatures can discolor polyester resin coated marble facings and
can cause the polyester resin coating to fail near the top convection air gap.

Mendota Fireplace cannot guarantee suitability o f use of any
marb le slabs or tiles that have a polyester resin coating a pplied
to it and cannot guarantee again st d iscolorat ion or structural
fai lure of marbl e o r polished stone facings that have a polyester
resin coating. Consult with your local stone supplier.

Prior to use of any marble, granite or polished stone facing material,
especially white colored ones, run heat exposure tests on a sample piece.
Expose sample pieces to temperatures between 275oF and 350oF for a period
of eight hours. Compare the heat exposed sample to a control unheated

Figure 3-19 Top Air Gap

TOP AIR
GAP

85-03-01120 M27 Page 27

piece and judge for color changes. Do not use if any color changes are evident.
Mendota recommends the use of honed bare marble and bar e ston e facing materials or honed bare granite

and epoxy resin coated granite only.
Mendota cautions that due to natural structural defects that can exist within marble and stone pieces, cracking and/or flaking

of the marble or stone is possible and must be considered prior to selection and application around Mendota Fireplaces.
Mendota further cautions that proper adhesives be used to attach stone facings. Pay attention to the potential of off-gassing of
chemical vapors from mastic and other adhesives. Improper selection can lead to emission of chemicals with unwanted smells.

Suitable Backer Materials R-Ratings

R-Values of common Backer Materials

Material

Thickness

R-Value

Mineral Fiber Board ( Micore 160)

1/2"

1.270

Mineral Fiber Board (Micore 300)

1/2"

1.030

Mineral Fiber Board (Micor SB)

1/2"

1.470

Cearmic Board (Rescor 360)

1/2"

1.110

Cearmic Board (Fiberfrax Duraboard LD)

1/2"

1.100

Skamolex (475, 600, 700, VIP-12, HD)

1”

0.410

Promat Promafour

1”

0.410

Gypsum or Plaster Board

1/2"

0.450

Cement Board (Hardibacker 500)

1/2"

0.200

Cement Board (Hardibacker)

1/4"

0.130

Common Brick

2-1/4"

0.450

Common Brick

4"

0.800

Suitable Finishing Materials R-Ratings

R-Values of Common Facing Materials

Material

Thickness

R-Value

Cement Mortar

1/2"

0.100

Concrete

1"

0.095

Ceramic Tile

1/4"

0.020

Flagstone

1"

0.079

Granite

1"

0.083

Limestone

1"

0.153

Marble

1"

0.090

Sandstone

1"

0.079

Slate

1"

0.100

85-03-01120 M27 Page 28

Suitable Paints and Sealant Materials

3.2.12.5.1 Paint Types Approved for Use

Industrial Acrylic Paints, Alkyd based Paints. When selecting paint for applications on facings, mantels, corbels or floors within

2’ in front of a fireplace raised 6” or higher, avoid off the shelf paints which may have modifier additives used to increase
“hiding” ability, accelerate drying times and curing times. Consult with a reputable paints and sealants supplier and acquire

industrial acrylic paints or alkyd-based paints.

3.2.12.5.2 Sealants Type Approved for Use

Heat resistant polyurethane sealants which are not damaged by prolonged exposure to raised temperatures. Many are flame
resistant, meaning that they resist ignition when exposed to high temperatures and can insulate the substrate and delay
damage to it. When selecting polyurethane for applications on facings, mantels, corbels or floors within 3’ in front of or above a
fireplace, avoid off the shelf urethane sealants which may have modifier additives used to accelerate drying times and curing
times. Consult with a reputable paints and sealants supplier and acquire heat resistant polyurethane sealants.

3.2.12.5.3 Wood Application Cautions

If wood used around or in front of the fireplace has been chemically cleaned or bleached prior to staining or painting, it is of the
utmost importance to make certain that the cleaner or bleach does not remain in the wood substrate under the final paint or
sealant applied. If any cleaner or bleach remain within the wood structure, application of heat from the fireplace, even low-level
heat, will cause the cleaner or bleach compounds to expand or evaporate causing separation of the paint or sealant from the
wood surface and may cause peeling or bubbling of the paint or sealant.
Moisture content of the wood substrate is also of critical importance. High moisture content wood when heated will yield
evaporation of the moisture and hydraulic pressure under the paint or sealants which can lead to peeling or bubbling. Always
select the lowest moisture content wood substrate.
Refer to Mendota Fireplace Curing Instructions, Chapter 3.1.1.

85-03-01120 M27 Page 29

FRAMING DEPTH and FINISHING MATERIAL THICKNESS

The nominal framing depth for this fireplace is 14 inches. except for a corner installation and for installations that use solid
Granite or Marble slabs as fascia materials. The framing depth may be left at 14” deep or reduced based on the finishing
material thickness.

Finish

Material

Thickness

Max.

Framing

Depth

½”

13 ½”

¾”

13 ¼”

1”

13”

1 ¼”

12 ¾”

1 ½”

12 ½”

1 ¾”

12 ¼”

2”

12”

Figure 3-20 FRAMING DEPTH/ FINISHING MATERIAL THICKNESS

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Finishing Materials Cutting Dimensions

Figure 3-21 FINISHING MATERIALS CUTTING DIMENSONS

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Recommendations for Television Installation

Note: The model depicted in the images is a representation of a Mendota Hearth fireplace. These recommendations apply to all

Mendota Hearth Fireplaces.
When planning to install a television or other heat sensitive product above your fireplace, there are some points to consider.
Many television manufacturers specify in their installation instructions that the television must not be installed near or above a

heat source. The decision to install a television near or above a Mendota fireplace rests solely on the consumer. It is the
consumers responsibility to satisfy television specifications and insure the television will not exceed maximum operation
temperatures. Mendota Hearth will not be held liable for any adverse effects on a television or other products located near to a
Mendota Hearth fireplace.

The drawings below show recommendations that may be used as a guide for those consumers that decide to locate a television
above a Mendota Hearth fireplace. These recommendations have been found to reduce the heat impact to a television when
installed above a Mendota Hearth fireplace.

Recommendation 1: Add a mantel

Add a mantel above the fireplace. The mantel shall be at least 2 inches deeper than the depth of the television, and at least as wide
as the television. The mantel shall be mounted so that its top surface is a minimum of 18 inches above the top air gap of the
fireplace.

Attention: If the mantel is constructed of combustible materials, make certain that the entire mantel meets the clearances to
combustible mantel requirements.

85-03-01120 M27 Page 32

Recommendation 2: Create a recessed cavity

Frame a recessed cavity above the fireplace. The cavity shall be at least 6 inches taller and 6 inches wider than the television. The
cavity’s bottom surface must be a minimum of 24 inches above the top air gap of this fireplace. The cavity must be deep enough for
the television to be recessed at least 2 inches in from the wall.

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Venting

Th e M27 Fireplace must be vented to th e outside and must use one of the approved coaxial rigid ducting
sy stems. Do Not Use any silicone sealants at pipe joints. Stove gasket cements may be used at pipe

joints but is not required.

The M27 Fireplaces requires coaxial rigid- 4” diameter exhaust & 6-5/8” diameter air inlet and approved vent caps for most
installations. In some special cases, flexible ducting may be used. Contact Mendota Technical Service Department if your
installation requires other than standard rigid 4” X 6-5/8” Coaxial venting components.
All UL Listed Coaxial Rigid 4” X 6-5/8” Vent pipe components and vent caps are approved for use. Do not mix components of
different brands or series. Always use the same brand and series components throughout the entire vent system.

All wa rranties will be voided and serious fire, health or oth er safety haz ards may result from any of the
fol lo win g act ions: Installation by unauthorized personnel; installation of any damaged component;
unauthorized modification of vent system; installation of any components not approved by Mendota; failure
to meet all clearance requirements; failure to pro perly twist -lock and positively seal all components.
Consult local building codes before beginning th e installation.

WARN ING: Always maintain required clearances (air spa ces) to combustibles to prevent a fire hazard. Do
not fill air spaces with insulation. Check installation in stru ction s for minimum clearance requirements
between the outer walls of the vent pipe and nea rby combustible surfaces. Be sure to check th e ven t
ter min ation clearance requirements from decks, windows, so ffit, ga s r egu lators, air supply inlets, and public
wal kways, as specified in these installation ins tructions and local buildin g codes.

SAFETY PRECAUTIONS FOR THE INSTALLER: 1) Wear gloves and safety glasses for protection; 2) Exercise extreme caution when
using ladders or on rooftops; and 3) be aware of electrical wiring locations in walls and ceilings.

This gas appliance and vent system must be vented directly to th e ou tside of the building, and never
attached to a chimney serving another solid fuel or ga s burn ing appliance. Each direct vent gas appliance
must have its own separate vent system. Common vent systems are proh ibited.

To a ssure proper venting performance of this high -performance
Mendota Direct Vent Fireplace, it is critical that all brand s of vent pipe
sect ions are sealed tightly and leak -proof. This means that all pipe
sect ions must be carefully rotated into the fully "twist -locked" position.

We strongly recommend that fixed length pipe sections be used in place of telescoping
sections whenever possible.

COMPONENT "TWIST-LOCK" CONNECTION PROCEDURE

DuraVent and American Metals pipe and fittings are designed with special twist-lock
connections. Twist-lock procedure is as
follows: four (4) indentations, located on the female ends of pipes and fittings are
designed to slide straight in to the male ends of the adjacent pipes and fittings, by
orienting the four pipe indentations so that they match and slide into the four entry slots on the male ends.
Push the pipe sections completely together then twist-lock one section
clockwise, approximately ¼ turn until the two sections are fully locked. The
female locking lugs will not be visible from the outside on the black pipe or
fittings. They may be located by examining inside of the female ends.

Wall Heat Shield for Horizontal Vent Caps

Always use heat shield (#AA-11-00458) when the exterior wall covering is
made of vinyl, wood or other combustible materials. Heat shield (#AA-11-

00458) or an equivalent heat shield shall be installed. This Heat shield is

available for order directly from Mendota fireplaces.

Figure 3-22WALL HEAT SHIELD

85-03-01120 M27 Page 34

Flue Venting Components Identification Diagrams

Prior to installing at altitudes higher than 7500, please contact the Mendota technical service department for specific
venting requirements and venting restrictions.

ITEM

DESCRIPTION

1

6" or 7” PIPE (DuraVent 6”/Amerivent 7”), 9”, 12”
2

12" VENT STACK

3

24" VENT STACK

4

36" VENT STACK

5

48" VENT STACK

6

90ºGALVANIZED ELBOW

6a

45º GALVANIZED ELBOW

7

ADJUSTABLE WALL THIMBLE

8

ATTIC INSULATION SHIELD 12"

9

ROOF FLASHING (0/12 TO 6/12)

10

ROOF FLASHING (7/12 TO 12/12)

11

STORM COLLAR

12

VERTICAL VENT CAP

13

SUPPORT BAND

14

HORIZONTAL VENT CAP

15

FIRE STOP SPACER

14

7

6

1

12

11

10

9

15

13

1,2,3,4,5

85-03-01120 M27 Page 35

Approved Vent Systems

85-03-01120 M27 Page 36

Exterior Vent Locations and Restrictions

Note: All measurements are to be taken from the center of the vent cap.

 - Vent Terminal

X - Air Supply Inlet

 - Area where terminal is not permitted

A = Clearance above grade, veranda, porch, deck, or
balcony (*18 inches (45 cm) minimum)

H = *Not to be installed above a meter/regulator assembly
within 3 feet (90 cm) horizontally from the center-line
of the regulator; within a height of 15 feet

B = Clearance to window or door that may be opened
(*18 inches (45 cm) minimum.

I =

*Clearance to service regulator vent outlet *3 feet (92
cm) minimum.

C = *Clearance to permanently closed window
(minimum 18 inches (45 cm) recommended to
prevent condensation on window)

J =

*Clearance to non-mechanical air supply inlet to
building or the combustion air inlet to any other
appliance.
12 inches (30 cm) minimum.

D = *Vertical clearance to ventilated soffit located
above the terminal from the center-line of the
terminal 18” (45 cm) min. Minimum 24” (60 cm to
Vinyl Soffit)

K = *Clearance to a mechanical air supply inlet
In USA, 3 feet minimum above, if within 10 feet

horizontally. In Canada, 6 feet minimum

E = *Clearance to unventilated soffit 18” min (45 cm)
min. Minimum 24” (60 cm to Vinyl Soffit)

L = † Clearance above paved side-walk or a paved
driveway located on public property (*7 feet (2.1 m)
minimum)

F =

Clearance to outside corner - 12 inches (30 cm).

M = Clearance under veranda, porch, deck, or balcony (*18
inches (45 cm) minimum ‡)

G = Clearance to inside corner - 12 inches (30 cm).
Vinyl surfaces require 24” min (60 cm).

N=

Minimum 24” horizontal clearance to any surface,

such as an exterior surface, for vertical terminations.

85-03-01120 M27 Page 37

Side by Side installation of two Vent Caps

When two or more vertical vent caps are located within proximity of one another, it is required that a galvanized steel 18-gauge
or heavier barrier wall be installed between the two vent caps to eliminate recirculation of exhaust gases from one cap to
another.
The galvanized steel barrier shall be 6" taller than the highest point of the vent caps and shall be 3" wider past the outer edges of
the vent caps.
If two gravity direct vent system gas appliances are terminated next to each other, the minimum required distance between the
vertical center line of the vent caps is 18” to prevent recirculation of exhaust from one vent cap outlet into the air intake of
another vent cap.
If a wood burning flue opening is adjacent to a gravity direct vent system gas appliance vent cap and the distance between
vertical center lines of the two terminations is less than 36”, we recommend a metal divider plate be installed to prevent wood
burning exhaust from entering the gas appliance air intake path. Alternatively, you may also vertically extend the wood burning
flue liner up 24” higher than the top surface of the gas appliance vent cap.

Figure 3-23 Side by Side Vent Caps

85-03-01120 M27 Page 38

Decorative Cover for Vent Cap

It is acceptable to install a decorative stone, metal or terra cotta cover to disguise the vent terminal/cap used on Mendota
Fireplaces if the decorative cover meets the following minimum requirements:

1. The decorative cover shall be manufactured from noncombustible materials.

2. The decorative cover shall provide a minimum of 3” clearance from the outer surface of the vent cap to the inner walls

of the decorative cover on all sides of the vent cap, including on top above the vent cap.

3. Fresh air openings shall be provided at a level equal to or below the fresh air openings in the vent cap. The fresh air

openings shall provide a minimum open area of 60 square inches. This fresh air opening area shall be broken into at
least two equal openings (or more if possible). Each opening shall have a minimum height of 2” and a length that
provides the required opening to yield a total of 60 square inches, minimum.

4. The fresh air openings shall be protected in a manner that prevents the accumulation of snow which can plug the fresh

air openings.

5. Exhaust outlets must be 2X in area compared to the exhaust outlet openings of the vent cap and the exhaust outlets

must be positioned starting at the same level or higher than the lowest level of the exhaust outlet ports of the vent
cap.

Examples of Decorative Covers for Vent Caps

Figure 3-24 Decorative Covers

85-03-01120 M27 Page 39

3.3 ELECTRICAL TECHNICAL REFERENCES

AC Power Requirements

WARNING: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.

For operation of the blowers, this appliance requires 120 VAC, 2 Amp power sou rce. Th e AC power supply to
this Fireplace must be hot at all times and shall not have a switch installed in it.

This appliance is equipped with an electrical junction box on the
right side.

Planning for AC Power Connection

On the right-side, you will find an electrical junction box with a
strain relief clamp. To connect AC power to this Fireplace, follow
these steps:

1. Remove the junction box cover plate (secured with two

screws), route the 3-wire end of house power wire cable
through the strain relief in the cover plate.

2. Strip the ends of the house power wires and the three-color

coded wires within the junction box. Connect each color­coded wire to corresponding colored wires within the
junction box. Use the supplied wire nuts to connect each
wire pair ends.

Note: When connecting two braided
wires using wire nuts, strip both
braided wires ends at least ½” and
twist the two bare ends together
before using wire nuts. When
connecting a braided wire to a solid
copper wire, strip the solid copper

wire end ½” and the braided wire
end ¾”. Twist the braided wire

around the solid copper wire end before applying the wire nut.

3. Place connected wire ends within junction box then close and secure the junction box cover plate.

AC Power Connection Option

Figure 3-25 Electrical Junction Box

STEP 1

Figure 3-26 Wire Connections

STEP 2

STEP 3

85-03-01120 M27 Page 40

Ignition System & Burner Controls System Diagrams

Note: Connect wires in junction box located on the right side
of this appliance to house power using supplied wire nuts.
Replacement wires must have the same type and size of
insulation as the original.

This appliance must be electrically connected and grounded
in accordance with local codes or, in the absence of local
codes, with the current NFPA 70- National Electric Code or
CSA C22.1- Canadian Electrical Code.
Label all wires prior to disconnection when servicing
control. Wiring Errors can cause improper and dangerous
operation. Verify proper operation after servicing.

Convection Blower System

Dual blowers are provided as standard equipment with this M27 Fireplace. The dual blowers have an air output rating of 190
CFM (in free air). This Fireplace is designed to operate with the blowers turned off or on. Turning the blower on aids in
distributing and circulating heat to the room this Fireplace is installed in.

BLOWER OPERATION

The blower speed control (rheostat) supplied with this blower system can turn the blowers ON or OFF and infinitely regulate the
speed of the blowers. The blower air output can be regulated by turning the rheostat knob.
NOTE: There will be a time delay in blower operation during "heat-up" (approx. ½ hour) and extended blower operation during
"cool-down" of unit (approximately ½ hour).

Figure 3-27 BLOWER CIRCUIT DIAGRAM

85-03-01120 M27 Page 41

3.4 PLUMBING TECHNICAL REFERENCES

Gas Supply Requirements

NOTE : if Fireplace is to be operated with LP gas, see Natural Ga s to LPG Conversion Section in this manual
before proceeding.

CORRECT GAS PRESSURE AND PROPER GAS SUPPLY LINE SIZING IS IMPERATIVE TO THE SUCCESSFUL PERFORMANCE OF YOUR
MENDOTA GAS FIREPLACE. BE SURE THE GAS SUPPLIER OR PLUMBER CAREFULLY CHECKS FOR CORRECT GAS PRESSURE AND
GAS LINE SIZING WHEN INSTALLING THE FIREPLACE.

IT IS CRITICAL TO CAREFULLY CHECK FOR GAS LEAKS WHEN HOOKING UP THE FIREPLACE. CHECK WITH SOAP AND WATER
SOLUTION OR COMBUSTIBLE GAS SNIFFER.

BE SURE TO INSTALL CSST FLEX GAS LINE WITH BRASS-TO-BRASS FITTINGS TO PREVENT GAS LEAKS AT CONNECTIONS.

GAS SUPPLY PIPING MUST INCLUDE A DRIP LEG TO ELIMINATE THE POSSIBILITY OF CONTAMINANTS ENTERING THE GAS
TRAIN. ADHERE STRICTLY TO LOCAL AND NATIONAL CODES.

Gas Supply Line Sizing

This Mendota Gas Fireplace comes equipped with a 1/2" N.P.T. Female inlet. Gas supply piping must enter the Fireplace cabinet
on the left side.

Use the table, below, to determine the proper gas line diameter that must be installed to run from the supply regulator to the
factory installed manual shutoff valve. Refer to the following table for proper gas pipe diameters.

PIPE LENGTH

[FEET]

SCHEDULE 40 PIPE

INSIDE DIA.

TUBING, TYPE L

OUTSIDE DIAMETER

NAT.

L.P.

NAT.

L.P.

0-10

1/2" [1.3 cm]

3/8" [1.0 cm]

1/2" [1.3 cm] 3

/8" [1.0 cm]

10-40

1/2" [1.3 cm]

1/2" [1.3 cm]

5/8" [1.6 cm] 1

/2" [1.3 cm]

40-100

1/2" [1.3 cm]

1/2" [1.3 cm]

3/4" [2.0 cm] 1

/2" [1.3 cm]

100-150

3/4" [2.0 cm]

1/2" [1.3 cm]

7/8" [2.3 cm] 5

/8" [1.6 cm]

150-200

3/4" [2.0 cm]

1/2" [1.3 cm]

7/8" [2.3 cm] 3

/4" [2.0 cm]

NOTE: Some areas allow copper tubing or galvanized pipe - check with local approval agencies and codes NEVER use plastic

pipe.

Figure 3-28 Gas Line Inlet Location

85-03-01120 M27 Page 42

Gas Pressure Requirements and Checking

Two pressure taps for checking input and output gas pressures are located on the main gas valve. A qualified installer should
use this fitting for setting the correct gas pressure during initial installation.

Th e appliance and its appliance main gas
val ve mu st b e disconnected from the gas
supply p ipin g system du ring any pressure
testin g of that system at test pressures in
excess of 1/2 psi (3.5 kPa).

Th e appliance must be isolated from the gas
supply p ipin g sy stem by closing its equipment
shut -off valve during any pressure testing of
the gas supply piping system at test pressures
equal to or less than 1/2 psi (3.5 kPa).

Drip Leg Requirement

A drip leg/ sediment trap must be installed within the
main gas supply line serving this appliance.

Figure 3-30 Drip Leg/ Sediment Trap

Manual Gas Shutoff Valve Requirement

If local building codes require one, obtain an external keyed wall-mounted or
floor-mounted manual gas shutoff valve approved per local gas plumbing codes
and install per local gas plumbing codes in the specified location. Local
requirements supersede all other codes.

Figure 3-29 Main Gas Valve

Figure 3-31 Keyed Manual Gas Shutoff
Valve

85-03-01120 M27 Page 43

Factory Installed Manual Gas Shutoff Valve

A manual gas shutoff valve is factory installed and located in the left-side above the main gas valve. To operate the manual gas
shutoff, open left side door to expose controls. Located manual gas shutoff handle. Rotate clockwise to shut off gas flow or
counter-clockwise to turn on gas flow.

Figure 3-32 MANUAL GAS SHUTOFF

Gas Inlet Fittings Information

Caution: Before you run the ga s line, read, understand and properly calculat e th e r equired gas line size.
Impr oper (too small) gas line size application can lead to improper burner ignition and can cause property
damage and/or injury. If you are not qualified or c ert ified to run a gas line, do not proceed. Contact a
qualified Gas Plumber.

The gas inlet fitting supplied with this Fireplace provides a 1/2” female NPT fitting. This requires you to supply a ½” NPT male
fitting for connection to this appliance.
Based on the gas line size you have selected use an appropriate NPT fitting to adapt and connect to the 1/2” male NPT end
adapter.

85-03-01120 M27 Page 44

Gas Input Rate Verification

Natural Gas Input Rate Verification

1. Verify main orifice size. The main orifice body has the orifice hole size stamped on it. NG orifice size shall be #45
(rear burner) and #51 (front burner) for all elevations in between 0-2000ft. NG orifice size shall be #46 (rear burner)
and #52 (front burner) for all elevations exceeding 2000ft.

2. Verify that the Manifold Gas Pressure is within 3.5" WC +/- 1/8".
Once setup, read the main home gas supply meter reading.

3. Write the initial reading here >> initial gas meter reading
Turn off all other appliances and their pilot flame in the home.

4. Run this appliance for a period of 30 minutes on maximum flame size. Turn off main burner and pilot
flame. Read the main home gas supply meter reading after the 30 minutes of burn time.

5. Write the reading here >> final gas meter reading
Calculate the following:

6. FINAL GAS METER READING - INITIAL GAS METER READING...Subtract initial gas meter from final gas meter
reading. This will yield the number of Therms used during the 30-minute burn time.

7. Multiply the result in Item #6 by 100,000.

8. Multiply the result in Item #7 by 2. Write down the result here >>

9. The result in item #8 shall be at least maximum input rate (27,000 Btu) for altitudes below 2000 Feet. For altitudes
higher than 2000 feet, the result in item #8 shall be at least 26,200 Btu.

LPG Input Rate Verification

10. Verify main orifice size. The main orifice body has the orifice hole size stamped on it. LPG orifice size shall be #56
(rear burner) and #59 (front burner) for all elevations in between 0-2000ft. LPG orifice size shall be #57 (rear
burner) and #60 (front burner) for all elevations exceeding 2000ft.

Verify that the manifold gas pressure is within 10.0" WC +/- 1/8".

High Altitude De-Rating

Consult with your local gas supplier regarding high altitude derating necessity. It may not be necessary to
change orifice sizes if the gas supply is already adj ust ed for h igh a ltitu de usage.

If you are de-rating this appliance at a high altitude, attach the High-Altitude De-Rating Label, supplied in the Owner’s
Manual Packet, to the back surface of the listing label plate located in the air gap at the bottom of the Fireplace. If you
are also converting the Fireplace for LP Gas attach the labels included with the conversion kit to the same surface.
Prior to attaching the label, fill in all the information that is requested on the label.

For installations from 610-1370 meters (2000-4500 ft.) the orifice sizes (DMS) for Natural Gas are #43(Rear) and
#43(Front) and Propane Gas are #55(Rear) and #55(Front), respectively. See data plate for additional information. For
high altitude installations consult the local gas distributor or the authority having jurisdiction for proper rating methods.
If the installer must convert the unit to adjust for varying altitudes, the information sticker must be filled out by the
installer and adhered to the appliance at the time of conversion."

This appliance has been converted for use at an altitude of:

Orifice size:

Manifold Pressure:

Input (Btu/h):

Fuel Type:

Date of conversion:

Converted by:

Cet appreeil a été converti au ____
Injecteur ________
Pression à la tubulure d'alimentation _____________
Déoit calorifique ______________

85-03-01120 M27 Page 45

INSTALLATION INSTRUCTIONS

4.1 INSTALLATION CHECKLIST

The instructions provided in this chapter are arranged in the sequence of occurrences.
This installation checklist is supplied as a guide for installers to follow step by step. As you complete each step of the installation

work, check mark the completed work item in the list, below. All items in this installation checklist must be completed. When all
work is complete, fill in your name and the date this installation was completed.

❑ Unpack the Fireplace body.
❑ Open and inspect the Manual Packet.
❑ Unbolt the Fireplace body from the wooden pallet.
❑ If planning to burn LPG, perform the NG to LPG conversion work.
❑ Place Fireplace body inside Framed Chase, level and plumb fireplace body and secure to framing studs.
❑ Open the Fireplace Glass Door.
❑ Measure chimney Length required.
❑ Install Vent System.

❑ Sealant is not required at vent joints. Do not use silicone sealants in vent connection joints anywhere.
❑ Adjust exhaust damper to match vertical chimney length. See 4.13.12 Vent Damper Adjustments
❑ Co-axial vent rigid pipe, wall vent cap or roof vent cap is installed by a Mendota approved

serviceperson in accordance with instructions.

❑ All joints are secured, "twist-locked" and leak-proof.
❑ Horizontal or vertical vent cap is installed "right-side-up" and tightly sealed to structure per

instructions.

❑ Proper exterior and interior clearances for vent systems and locations for wall vent cap/roof vent cap

are maintained.

❑ Correct gas pressure, proper size gas lines and gas leaks are checked.
❑ 120 V electrical service and gas supply is installed in accordance with instructions and local and

national codes.

❑ Telescoping sections are not separated. They were used as complete assemblies.

❑ Connect Gas Supply to the Fireplace. Verify that gas pressures are proper and perform a complete leak test of all field

installed gas joints and factory installed gas train joints using a gas sniffer.

❑ Verify orifice sizes.

❑ Verify gas input rates.

❑ Connect Electrical Supply to the Fireplace. See 3.3.2.1 AC Power Connection Option .
❑ Install firebox inner liner kit. Follow instruction supplied with the Liner Kit.
❑ Install log set, coals and inswool media.

❑ Install Glass door and assure that it is in proper closed position and centered in firebox opening.

❑ Test fire Fireplace.
❑ Teach consumer how to use remote control and all functions of this Fireplace
❑ Complete warranty registration at http://mendotahearth.com/gas-fireplace-and-stove-registration.php

This installation was performed and completed by:

Date:

85-03-01120 M27 Page 46

4.2 UNPACKING THE FIREPLACE

The Fireplace arrives from the factory on a wooden pallet with a cardboard box encasing the pallet and Fireplace. To remove
the outer box, identify and remove four Philips head drywall screws that secure a cardboard L pincher at the bottom of each
corner of the box.
Lift the outer box vertically straight upward until lower edge of the box clears the top of the unit body. Set the box aside.
Mendota recommends recycling the outer box.

Figure 4-1 Outer Box Removal

85-03-01120 M27 Page 47

4.3 CONTENTS OF THE MANUAL PACKET

Once the outer box is removed, you will find the Fireplace body and a manual packet white box. This manual packet white box
includes the items shown in the table, below. Contact Mendota Technical Service if any parts are missing.

Glass Latch Tool #HA-77-00256
Must Leave with Homeowner.

WALL THERMOSTAT #05-01-00198
Must Leave with Homeowner.

NO IMAGE

INSWOOL BAG #35-01-00239

NO IMAGE

SMALL COALS BAG #35-01-00240

NO IMAGE

LARGE COALS BAG #35-01-00311

NO IMAGE

Owner’s Manual.
Must Leave with Homeowner.

This Manual

Figure 4-2 Manual Packet Contents

4.4 ITEMS PACKAGED INSIDE FIREBOX

• Firebox Lining (Red Brick or Milano Tile, depending on the specific model selected)

• Fiber Log set

4.5 WHAT IS NOT INCLUDED WITH THIS APPLIANCE?

Decorative front (s) are not included with this base Fireplace product. One of many decorative fronts options must be selected
and purchased separately.

85-03-01120 M27 Page 48

4.6 UNBOLTING FIREPLACE FROM PALLET

The Fireplace body is bolted to the pallet top surface using 5/16” X 1” Lag Screws in three points. One on each side and one or
more at the rear. Use a 1/2” socket and wrench to remove the lag screws and detach fireplace from the pallet top.

Figure 4-3 Unbolting Unit from Pallet

85-03-01120 M27 Page 49

4.8 TO REMOVE DOOR

Use the glass latch tool to disconnect the spring latches from the glass frame. Insert tool into hole in latch, pull towards you and
rotate 180-degrees to disengage top latches. Remove tool. There are four spring latches on this gas fireplace. Always make
certain the hook glass latches are in the inverted position after removing the glass frame. This inverted latch position will make
it easier to reinstall the glass frame later.
With both hands, rotate top edge of glass frame away from unit, approximately 8”.
Lift glass frame up 1”, at an angle, and move away from unit.
Door is now free from unit.

NOTE : Always check glass gasket condition and gasket seal any time th e glass door is removed and when
rein st all ing glass do or.

85-03-01120 M27 Page 50

4.10 TO REPLACE DOOR

1. Line up the two bottom tabs in glass frame bottom with two slots in the glass clips located at the bottom of firebox.

Insert tabs into slots and center tabs in slots, left to right.

2. Center glass frame over firebox; left to right.

3. After door has been placed into slots, rotate door towards firebox until gasket seal is touching the firebox frame.

4. Use the tool provided to connect the spring latches to the glass frame. Insert tool into hole in spring latch, pull latch

towards you, rotate latch so the hook is facing downward then release latch to hook to door frame. Repeat for all four
latches.

Door is now connected and sealed to unit.

85-03-01120 M27 Page 51

4.11 FIREBOX REFRACTORY LINER REMOVAL AND INSTALLATION PROCEDURES

WARN ING: Failure to position the parts in accorda nce with these diagrams or failure to use only parts
sp ecifica lly app roved with this appliance may result in property damage or personal injury.

The Mendota M-27 Gas Fireplace is shipped with a ONE PIECE domed refractory liner factory installed inside the firebox. M-27
model fireplaces with part number AA-11-00847 are equipped with a Red Chicago Style (Clinker) Brick patterned refractory
liner. M-27 model fireplaces with part number AA-11-00872 are equipped with a Milano Style Tiled refractory liner.

It will be necessary to remove and reinstall these liners during initial installation of these gas fireplaces and during routine or
annual inspection and maintenance. These refractory liners are FRAGILE and the utmost care must be exercised while removing
and installing them. Follow the instructions given below, in sequence, to remove and reinstall the refractory liners. Failure to
follow these instructions may lead to damage to the refractory liner. Damage or breakage caused by mishandling, abuse or not
following these instructions is not covered under the Mendota Warranty.

Figure 4-4 GLASS FRAME AND
GRATE REMOVAL

IMPORTANT: YOU MUST COMPLETE STEPS 7 AN D 8 TO GUARANTEE THAT THE REFRACTORY LINER IS
INSTALLED PROPERLY BEFORE FIRING THIS FIREPLACE.

1. Remove the Glass Frame Assembly by using the tool supplied and following instructions in the Door Re-moval

section in this manual..

2. Locate the Andiron Grate that is attached to the Burner Air box Ramp with two ¼” Hex #8x1/2 sheet metal screws.

Remove the two ¼” Hex #8x1/2 sheet metal screws using a ¼” nut driver or a ¼” Hex bit in an electric screw gun.

Lift the Andiron Grate out of the firebox.

3. See Diagrams on this page and follow instructions to loosen brick panel if it is tightly fit inside the firebox. The same

procedures apply for all style refractory liners.

4. Keep the Front-Bottom of the Refractory Liner Stationery and rotate the top domed edge forward and out of the

firebox.

5. Use one hand to support the Refractory Liner’s Dome area from the inside surface. Lift the Refractory Liner up and

slide it out of the Firebox horizontally.

6. Reinstall Refractory Liner inside firebox by following steps 5,4,3,2 and 1 in reverse.

ANDIRON

GRATE

GLASS

FRAME

85-03-01120 M27 Page 52

7. Once Refractory Liner is inside the firebox, push rear surface of refractory liner against rear wall of Firebox, firmly.

8. Install Refractory Retainer Bracket (supplied with the Owner’s Manual Packet as shown in the diagrams, below. The

Refractory Retainer Bracket must be installed in the same orientation as shown in the detail view below. The
Refractory Retainer Bracket is designed to push the Refractory Liner against the back wall of the firebox. It is critical
that you push the Refractory Liner firmly against the firebox back wall then attach the Refractory Retainer Bracket to
hold the Refractory Liner in that position.

85-03-01120 M27 Page 53

4.12 NATURAL GAS TO LPG CONVERSION

WARN ING
This conversion kit shall be installed by a qualified service agency in accordance with the manufact urer’s

inst ruct ions and all applicable codes and requirement s of th e autho rity having jurisdiction. If the
info rmation in these instructions is not followed exact ly, a fire, explosion or production of carbon monoxide
may r esult causing property damage, personal injury or loss of life. The qua lified service agency is
responsible for the proper installation of this kit. The in sta llation is not proper and complete until the
opera tion of the converted appliance is checked a s sp ecifie d in th e o wner instructions supplied with the kit.

WARN ING: Failure to position the parts in accorda nce with these diagrams or failure to use only parts
sp ecifica lly app roved with this appliance may result in property damage or personal injury.

General Conversion Information

WARN ING: Failure to position the parts in accorda nce with these diagrams or failure to use only parts
sp ecifica lly app roved with this appliance may result in property damage or personal injury.

Caution: The electrical supply to the fi replace must be turned off prior to performing the conversion. The
gas su pply must be shut off prior to disconnecting the electrical power.

Orifice sizes requirement

A Natural Gas to LPG conversion kit #HA-48-00025 must be ordered and installed to convert the M27 Fireplace to burn LPG.
LP Conversion Kit # HA-48-00025 contains the following parts: One manual Pressure Regulator, One LP Pilot Orifice Thimble,
One Cap Orifice drill #56 (for rear burner) and One Cap Orifice drill #59 (for front burner). Specifically, identify the Rear and
Front Burner Cap Orifices. Use proper sized drill bits’ shaft ends to verify orifice size.

Procedure to Convert This Fireplace to Burn LPG

Refer to these diagrams during the conversion processes:

Figure 4-5 Conversion Preparation

85-03-01120 M27 Page 54

WARN ING: It is of the utmost importance that the correct burner orifices be installed for both the rear

and front burners.

1. Turn off gas supply at the appliance service

valve if gas line has been connected to this
appliance.

Pressure Regulator Conversion

WARN ING: Failure to position the parts in
acco rdance with these diagrams or failu re to
use only parts specifically appro ved with th is
appliance may result in property damage or
personal injury.

2. Using a ¼” flat blade screwdriver, remove 3

screws that secure the NG Pressure Regulator
to the gas valve body and remove NG Pressure
Regulator. Identify the pressure regulator
spring that is located in the center of the black
rubber gasket. Discard both the black rubber
gasket and spring.

3. Install the new LP Pressure Regular onto the

gas valve body in the same position and
orientation as the NG Pressure Regulator you
removed in Step 2, above. The LP Pressure
Regulator can only be mounted in one
position. Secure the LP Pressure Regulator in
place using the 3 screws you removed in Step

2. Tighten down using a ¼” flat blade

screwdriver.

4. Install the enclosed identification label (G) to

the valve body where is can be easily seen.

Warning: Installation should be carried out in a cl ean en vironment .
Warning: This modulating conversion kit must only be app lied as part of a conversion kit supplied by the

fir eplace manufacturer for specific fireplace and type of gas being con vert ed.
Warning: Correct operation of the system cannot be gu aranteed if the co nversion kit or value have been

dropped or sustained strong impact
Warning: A leak test must be conducted as the fin al step after conversion to burn LPG.

Figure 4-6 Pressure Regulator Conversion

85-03-01120 M27 Page 55

5. Remove both rear and front burners. Locate and

identify the rear burner orifice spud and the
front burner orifice spud. Both front and rear
orifice spuds are removed and installed using a
½” deep well socket and ratchet.

6. Install rear burner orifice #65-14-00056(#56

drill) for the rear burner. Tighten down securely.

7. Install front burner orifice #65-14-00059 (#59

drill) for the front burner. Tighten down
securely.

8. Locate Pilot Light on right side of firebox. While

holding the pilot base body with large vice grips
tightly, loosen pilot light hood using a 7/16”

open end wrench on the hex shaped base. Rotate counter clock-wise ¼ turn to loosen. REMOVE THE PILOT HOOD.

9. Remove the NG Pilot Orifice Thimble (Pilot orifice thimble is located inside pilot hood base).

10. Insert the LP Pilot Orifice Thimble.

11. Thread on the pilot hood into pilot body base by hand until finger tight.

12. Tighten down hex shaped base of pilot using a 7/16” open end wrench.

CAUTION: Always use one 7/16” open end wrench and one large pli ers or vice grips tool to hold, loosen and
tighten pilot hood base to prevent damage to pilot mount bra cket.

Figure 4-7 Removing Orifices

Figure 4-8 Pilot Orifice

Figure 4-9 Pinch Pilot Base with Vice Grips

85-03-01120 M27 Page 56

Burner Ignition Characteristics

Note: Connect gas supply and verify that the mini mu m in let and outlet pressures are conforming.
Once the conversion to LPG and all the above steps have been completed, light the main burners.

Use remote transmitter to turn on pilot light and burners. Main burner should now light IMMEDIATELY and flame should not
"lift" off burner. If there is any delay in ignition or if flame is "lifting off" burner, turn off burner and carefully check for proper
installation of logs/coals, vent system and proper pilot flame impingement on burner. Logs or coals must not block pilot flame
or main burner flame. Vent system must be leak proof.

WARN ING: Do not proceed with operation of this fireplace un less burner "cycles" on/o ff without d elays!

Pilot Flame and Burner Relationship Verification

Prior to completing the LPG conversion process, the qualified service technician must light the pilot light and verify the
relationship between the pilot light flames and the main burners. The pilot light flames directed towards the propagation ports
on the rear and front burner must overlap the propagation ports on the burners.

Th e pil ot light flames must be a minimum of 1” long and mu st o verlap the propagation ports on both the

rear and front burners as shown in th e diagra m, b elo w. Veri fy th at the burner tubes ignite quickly and the
burner flames propagate smoothly along the entire l eng th of the burners.

Figure 4-10 Pilot Flames

Figure 4-11 Pilot Flame and Burner Ports

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4.13 VENTING

WARN ING: Proper installation of the vent system, as required in this manual, is vital to the performance of
this Fireplace. Oversights or failure to c onform to all installation requ irements will void the applicable
war ranty.

Th e M27 Fireplace must be vented to th e outside and must use one of the approved rigid coaxial ducting
sy stems.

This h eat er mu st b e properly connected to a venting system in ac cordan ce with t he manufacturer's
inst allation instructions. Operation of this heater when not connected to a properly installed and
main tained venting system can result in carbon monoxide (CO) poisonin g a nd possibly death.

If th e vent system of this appliance is disconnected for any r ea son, th e vent and air intake systems must be
properly reassembled and resealed b efore this appliance is put into use.

CAUTION: Each installation must con for m to all local, state and national codes. Refer to the nation al fuel
gas code and local zoning and code authorit ies fo r details on installation requirements. The Mendota
Fir epl aces must be vented to the outside in accordance with the latest edition of the National Fuel Gas
Code. In the absence of local codes, the installation must confo rm with National Fuel Gas Code ANSI Z223.1
(NFP A 54), or Canadian Code CAN1 -B149 or most current edition, also kno wn as NFPA 54. Do not connect
this Fireplace to a chimney flue serving a sepa rat e sol id fuel or gas-burnin g appliance.

Do Not Use any silicone sealants at pipe joints. Stove gasket cements may be used at pipe joints
but is not required.

Wall Thimble Information

A wall thimble is required to be installed when penetrating any combustible wall, regardless of whether the wall Is an internal wall
or an external wall.

Wall thimbles are designed to reduce the required clearances to the exterior surfaces of the vent pipe that pass through
combustible walls. The hole size that is specified to be cut in the wall for installation of the wall thimble takes into consideration the
reduced clearance requirement.

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M27 Master Venting Chart

1. 48 inches maximum horizontal pipe run

allowed with a 900-elbow connected
directly to this fireplace’s flue starter collar.

2. Maximum Vertical Run allowed is 45 feet.

3. Maximum Vent System length allowed is 45

feet.

V min

H max

0 in.

48"

6 in.

9'6"

12 in.

16'

18 in.

16'6"

24 in.

17'

30 in.

17'6"

36 in.

18'6"

4 ft. - 25 ft.

20'

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Maximum Horizontal Run

• Maximum Horizontal Run allowed is 20 feet if a vertical starter section that is between 4 feet to 25 feet is connected

directly to this fireplace’s flue starter collar and no more than three (3) 90-degree elbows are used.

• Maximum Horizontal Run allowed is 48” if a 90-degree elbow is connected directly to this fireplace’s flue starter collar.

Maximum Vent System Length

• Combined total length of all straight pipe sections in the vent system shall be less than 45 feet.

• Combined total length of all straight pipe sections in the vent system shall be less than 45 feet when using three (3) 90-

degree elbows or equivalent and terminating the vent system horizontally.

• Combined total length of all straight pipe sections in the vent system shall be less than 45 feet when using four (4) 90-

degree elbows or equivalent and terminating vertically.

How to Calculate the Vent Lengths

For calculation purposes and usage of charts in this manual, simply add the lengths of all individual straight pipe sections. For
example: if you use two 2-foot lengths and one 4-foot length, the total vent system length will be 2+2+4 = 8 feet.

USING 90 DEGREE ELBOWS

A single 90º vertical-to-horizontal elbow is already calculated into the allowable maximum 20' horizontal run. The Venting
Requirements Chart (Error! Reference source not found.) assumes that for all horizontal runs calculated, one 90-degree elbow i
s used within the venting system. Each additional 90º elbow reduces the maximum horizontal distance by 3'.

If you plan to use more than one 90-degree elbow within the vent system, first use the Venting Requirements Chart (Figure #14)
and calculate the maximum horizontal run you are allowed based on the first vertical section connected directly to the
fireplace. From this maximum horizontal run calculated, subtract 3 feet for each additional 90- degree elbow you will use.

CAUTION: If a vertical-to-horizonta l discharge elbow or a horizontal -to-horizontal discharge elbow is
enclosed within a wall, floor or ceiling, a top air space clearanc e o f 3" mu st be maintained. Be sure to
main tain 1" air space to any combustibles (2" above hor izonta l runs).

Example 1: By using three 90º elbows the maximum horizontal distance has been reduced to 14 ft. (3 - 1 = 2 elbows x 3' = 6';
20’ Max. - 6' of elbows = 14' of horizontal run).

Example 2: If the first vertical section connected directly to the Fireplace is between 4 feet and 25 feet long, you are allowed a
maximum 20 feet of horizontal run. If you plan to use two (2) 90-degree elbows in the entire system, subtract three (3) feet
from the 20 feet maximum horizontal run calculated. Your maximum allowed horizontal run would then be 17 feet. Similarly, if
you plan to use three (3) 90-degree elbows, subtract 6 feet; from the 20 feet maximum horizontal run calculated to yield a 14
feet maximum allowed horizontal run in that venting system.

USING 45-DEGREE ELBOWS

Two 45-degree elbows may be used in place of one 90-degree elbow. On 45-degree runs, one foot of diagonal pipe is equal to
8-1/2 inches horizontal run and 8-1/2 inches vertical run. Two 45-degree elbows may be connected directly to the vent starter
adapter on this fireplace to create an offset to provide the required clearances to combustible framing or sheathing materials.

Two 45-degree elbows may be connected directly to the top of this fireplace to create a horizontal offset. 20 feet maximum
horizontal run allowed with this offset configuration only if the first vertical section connected directly to the last 45-degree
elbow is more than 4 feet long. For maximum allowable horizontal distances with the 45-degree offsets, see the Master
Venting Configuration Chart.

Note: Each 45º elbow reduces the maximu m hor iz ontal distance by 1½ '.

SUPPORT: Horizontal runs of pipe will require one vent support for every 3 ft. of pipe.

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ZERO RISE HORIZONTAL TERMINATION

The M27 Fireplace must be installed by a qualified Mendota approved serviceperson.

A Maximum Horizontal Run allowed is 48 inches if a 90-degree
elbow is connected directly to this fireplace’s flue starter collar.
When a 90-degree elbow is connected directly to this fireplace,
the horizontal centerline of the 90ºelbow will be 44-9/16” inches
up from the floor level of this Fireplace.

See, MASTER VENTING CHART and Figures, below.
Use "fixed" pipe sections in place of adjustable pipe sections
wherever possible.

Always maintain 1" clearance from vent pipe sides and bottom to
combustibles, 3" clearance on top of pipe on horizontal runs and
on top of horizontal discharge elbows. Do not fill air spaces with
insulation or other material.

1. Position fireplace in desired location. See guidelines on

proper vent cap placement on the exterior of home. Check to
determine if wall studs are in the way when venting system is
attached. If this is the case, you may want to adjust the
fireplace location or modify the exterior wall framing to allow
the vent system to penetrate the wall.

2. Measure from the floor level of the fireplace up 44-9/16”

inches [add ¼” rise for every foot of horizontal run] and mark wall directly at the center of where the vent pipe will penetrate
the exterior wall.

3. Cut and frame a 9-1/4" wide x 10-1/4" high opening in the wall for use with a mandatory wall thimble. The hole must be

positioned so the vent system will run level or have a ¼" rise per foot of run AND be perpendicular to the wall. The height of
the opening must be located to meet all local and national building codes. Do not allow the termination to be easily blocked or
obstructed. If wall being penetrated is non-combustible material, i.e. masonry block, brick, etc., a 9-inch diameter hole is
acceptable.

4. Attach the 90-degree elbow to the fireplace starter adapter. Attach a horizontal section to the 90-degree elbow. Be sure all

vent component connections are in their fully twist-locked position and are leak­proof. The length of the horizontal piece that fits through the wall will be
determined by the location of the fireplace relative to the wall. For a normal
installation where this fireplace is installed directly against an exterior wall

constructed using 2x4 lumber or 2x6 lumber, only a 6” horizontal section is required.

There MUST be a minimum of 1" air space clearance to combustibles from all vent
components (3" above horizontal runs and horizontal discharge elbows).

5. A wall thimble must always be used when penetrating any combustible wall

materials.

6. From the exterior of the home, slide the horizontal vent cap over the end of the

horizontal pipe and tightly secure the cap to the wall with screws. Seal with a high­quality caulking.

NOTE: Combustible wall thickness must be 4" to 8" maximum for wall thimble
application.

NOTE: Vent Cap should not be recessed into wall or siding.

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VERTICAL RISE HORIZONTAL TERMINATION

The minimum vertical section required to be connected directly to the starter adapter on this fireplace is 48 inches when used
with a maximum horizontal run of 20 ft. If the total length of the vertical sections connected directly to the starter adapter on
this fireplace is between 4 feet and 41 feet, you are allowed a maximum 20 feet horizontal run.

Combined total length of all pipe sections (include restriction of elbows) in the vent system shall be less than 45 feet.
NOTE: The horizontal run of vent pipe must be level or have a ¼" rise for every 1' of run toward the termination. Never allow
the vent to run downward. This will cause high temperatures and the possibility of a fire.

This M27 Fireplace must be installed by a qualified Mendota service person

1. Position fireplace in desired location. See 3.2.16.5 Exterior Vent Locations and Restrictions for guidelines on proper vent

cap placement on exterior of home. Check to determine if wall studs are in the way when vent system is attached. If this
is the case, you may want to adjust the fireplace location.

2. Locate where vent pipe will pass through any ceilings and will penetrate the outside wall. Since vent pipe sections

"overlap" we suggest pre-assembling and measuring the total vent pipe run so you can more accurately locate the point
where the vent pipe will penetrate the outside wall. Be sure all vent components are properly twist locked and leak-proof.

3. Cut and frame a 9-1//4” wide x 10-1/4”” high opening in the outside wall opening (for use with a mandatory wall thimble)

and 9” x 9” opening in ceiling openings (for use with a mandatory ceiling fire stop). The outside wall hole must be
positioned so the vent system will run level or have a ¼" on rise AND be perpendicular to the wall. The height of the
opening must be located to meet all building codes and not allow the termination to be easily blocked or obstructed. A
ceiling fire stop spacer is required at all floor (ceiling) opening.

4. Connect vent pipe to the fireplace adapter on top of fireplace vent outlet.

5. The horizontal pipe must end flush with the exterior wall of the home.

Horizontal pipe will require a proper support every 3 ft. of vent pipe.
THERE MUST BE A MINIMUM OF 1" CLEARANCE TO COMBUSTIBLES
FROM ALL VENT PIECES ON THE SIDES AND BOTTOM AND 2" ABOVE
HORIZONTAL RUNS.

6. A wall thimble must always be used when penetrating combustible

wall materials and a ceiling fire stop must always be used when
penetrating combustible ceiling materials.

NOTE: Combustible wall thickness must be 4" to 8" maximum.

7. From the exterior of the home, slide the horizontal vent cap over the

end of the horizontal pipe and tightly secure the vent cap to the wall
with screws. Seal with high quality caulking.
NOTE: Venting terminal (Vent Cap) should not be recessed into wall or
siding.

V

H

6”

9’6”

12”

16’

2’

17’

3’

18’6”

4’- 25’

20’

For V greater than

25’, see Figure 16

on Page 20

85-03-01120 M27 Page 62

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VERTICAL THROUGH-THE ROOF VENTING

The maximum vertical run of vent pipe is 61 ft. from the top of the fireplace. The fireplace will support a run of a maximum of
61 ft. Maintain 1" air space clearances on all sides of vents (2" above horizontal runs).
If an offset is required directly on top of the fireplace, two 45o elbows may be connected directly to the top of this fireplace to
create a horizontal offset then to run upwards vertically. Doing so will continue to allow the use of the 61 feet maximum
vertical run.

The M27 Fireplace must be installed by a qualified Mendota approved serviceperson.

1. Place the fireplace in its desired location. Drop a plum bob from the ceiling to the position of the fireplace flue exit. Mark the

location where the vent will penetrate the ceiling. Drill a small hole at this point. Next, drop a plumb bob from the roof to the
hole previously drilled in the ceiling. Mark and drill the spot where the vent will penetrate the roof. Determine if ceiling joists,
roof rafters or other framing will obstruct the venting system. You may wish to relocate the fireplace or to offset, to avoid
cutting load bearing members.

2. Cut and frame a 9" x 9" opening in the ceiling centered on the hole drilled in Step No. 1.

3. To determine the length of the vent pipe required, measure the distance from the fireplace flue outlet to the ceiling, the ceiling

thickness and the vertical rise in the attic or second story and allow sufficient vent height above roofline. For two story
installations, fire stops are required at each floor level. If an offset is needed in the attic, additional pipe and elbows will be
required.

4. Assemble the desired lengths of vent pipe and elbows to reach from the fireplace flue outlet. Ensure that all vent pipe and

elbow connections are in their fully twist-lock position and that inner pipe joints are sealed and are leak-proof. Maintain 1"
airspace clearances to combustibles (2" above horizontal runs). Cut a 9" x 9" or larger opening in the roof, centered in the small
drilled hole placed in the roof in No. 1. Make the opening large enough to be of sufficient size to meet all clearance
requirements. Continue to assemble lengths of pipe and elbows necessary to reach up through the roofline. Galvanized pipe
and elbows may be utilized in the attic, as well as above the roofline. The galvanized finish is desirable above the roofline due
to its higher corrosive resistance.

a) If an offset is necessary, it is important to support the vent pipe every 3 ft. to avoid excessive stress on the elbows and

possible separation. Wall straps are available for this purpose.

5. Slip the flashing over the pipe sections protruding through the roof. Secure the base of the flashing to the roof with roofing

nails and seal flashing to roof. Ensure the roofing material overlaps the top edge of the flashing. Verify you have at least the
minimum clearance to combustibles at the roofline.

6. Continue to add pipe sections until the pipe and the vent cap meet the minimum building code requirement.

For multi-story vertical installation, a ceiling fire stop is required at the second floor and any subsequent floors. The opening
should be framed to 10" x 10" inside dimensions.

Add an attic insulation shield to keep attic insulation materials away from vent pipe.
Vertical Pipe runs must be supported using wall straps every 3 feet.

7. Any occupied areas above the first floor, including closets and storage spaces, which the vertical vent passes through, must be

enclosed. The enclosure may be framed, and sheet rocked with standard construction materials, however, be sure to maintain
minimum allowable clearances between the outside of the vent pipe and the combustible surfaces of the enclosure.

9. Height "*H" from roof surface to the top of vent cap can be determined as follows:

10. Complete installation with storm collar and vent cap.

"H" DIMENSION

ROOF PITCH

FEET

METERS

FLAT to 6/12

2

.6

7/12 to 9/12

2

.6

10/12 to 12/12

4

1.2

13/12 to 16/12

6

1.8

17/12 to 21/12

8

2.4

85-03-01120 M27 Page 64

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VERTICAL THROUGH-THE-ROOF VENTING USING THREE 900 ELBOWS

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Vent Damper Adjustments

This fireplace is equipped with a vent damper system that can be adjusted. Locate damper adjustment rod above the glass

frame in convection chamber at the center. If this fireplace’s vent is terminated horizontally, DO NOT CLOSE the vent damper

completely. Adjust position of damper by judging the flame characteristics after 20 minutes of burn time. If the flames ghost off
burners or if sooting occurs [in LPG units], open the vent damper FULLY and work backwards in increments to determine the
correct damper position for that particular installation.
Look into the convection air cavity and note the Damper Position Indicator. 1”

downward bend shows the damper plate position. Vertical position of the 1”

bend means the damper is fully open vertically.

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4.14 M27 LOG SET INSTALLATION INSTRUCTIONS

Cut the clear tapes and outer plastic wrap using a sharp utility knife or equivalent. Locate the 2 bags of coals, glow-ing embers
and the log pieces. Identify each log piece numbered A through G and the Large Chunk coals (H), Small coals (I) and Glowing
Embers (J) per the diagram show on this page.

CAUTION: HANDLE LOG PIECES WITH CARE. LOGS ARE FRAGILE

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Identify the REAR LOG PINS and the MAIN EMBER BED PINS that are pressed onto the Burner Air box.

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The completed log set shall look as depicted in the Step 14, above.
Add small coals (I), first, in the area between the firebox front edge and the grate bars. Also add small coals (I) in front and

behind the front burner. When adding the small coals, space them ½ inches apart, left to right, to allow combustion air to flow
to burner ports. Otherwise, place them randomly along the burner length and in any area on the firebox floor you desire.

Add Large Chunk Coals (H) on top of front burner. Space them apart about ¼ inches side to side and bridge coals that span
across the burner ports across the burner tube to the main ember bed (B) so that the coals do not plug any burner ports. This
also provides for a cove under each coal that will glow red and create an attractive ember bed effect. If you provide large gaps
between the large chunk coals and leave the gaps open, the front burner flames will yield random yellow flames along the front
edge and between the coal pieces.

Avoid packing small coals tightly. Doing so will only yield red glow effects.
Loosely spread Glowing embers over the coals and any other burner surfaces, lightly. Do not use large and dense amounts of

glowing embers in any area over burner ports. If taller flames are desired along front burner or rear burner, add thin layers of
glowing embers over burner ports in that area. If sooting occurs around areas where coals or glowing embers are located,
remove and allow more room in that area for gas and air to mix together properly.

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4.15 M-27 ASHTON SURROUND KIT INSTALLATION

INTRODUCTION

The surround kit, available for the M27 (Chelsea) fireplace, completes
the installation. The surround kit is designed to cover the exterior
structural parts and surfaces of this fireplace. It also provides for easy
access to the commonly used control panels located on the left and
right side of this fireplace. A surround kit must be installed to
complete this fire-place installation. Choose from one of 5 finish and
color options: Gold, Antique Copper, Swedish Nickel, Natural Iron or
Black. Optional Filigree kits (available in the 5 different finishes and
colors) or a Cast Iron Decorative Overlay are available and may be
purchased and installed during the installation of a Surround Kit or at a
later date. If any of these optional kits are to be installed, install them
on the surround parts before you follow these instructions to install
the sur-round kit on the fireplace.

Identify the parts included with the surround kit.

IMPORTANT: A Hearth Pad spacer is supplied with the fireplace. This it em must be removed before you
attempt to in-stall the Surround Kit on the fireplace.

ITEM

DESCRIPTION

QTY

1

SURROUND TOP

1 2 SURROUND LEG, LEFT HAND

1 3 SURROUND LEG, RIGHT HAND

1 4 SURROUND, BOTTOM

1 5 TEMPORARY BRACE, LEFT HAND

1 6 TEMPORARY BRACE, RIGHT HAND

1 7 1/8” X 1” HINGE PINS

4 8 WASHER, 1/8” ID. X 5/32 OD

4 9 8-32 HEX NUT

3

10

#8X1/2 SHEET METAL SCREW

8

85-03-01120 M27 Page 77

1. Positively identify the Left Hand and Right-Hand Surround Legs. The Pull Handle must be located in the bottom half of the

surround leg. Use this item to identify the Left Hand and Right-Hand Surround Legs.

2. NOTE: If the Pull Handles are not factory-assembled, attach one pull handle on each (left hand and right hand) surround leg.

85-03-01120 M27 Page 78

4. Lay the four main surround parts (Top, Left Hand Leg, Right Hand Leg and Bottom) on the floor with their visible sides facing

upwards. See Figure, below.

5. Insert one 1/8” X 1” Hinge Pin into the top and bottom Hinge Pin Holes in the Left Hand and Right-Hand Surround Legs.

6. Slide one 1/8” ID X 5/32” OD spacer washer over each pin.

7. Align Hinge pinholes in Surround Top with the Top Hinge Pins in the Surround Legs. Slide Surround Top over the Top Hinge Pins

until the spacer washer is pinched between the Surround Legs and the Surround Top.

8. Align Hinge pinholes in Surround Bottom with the Bottom Hinge Pins in the Surround Legs. Slide Surround Bot-tom over the

Bottom Hinge Pins until the spacer washer is pinched between the Surround Legs and the Surround Bottom

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9. Identify and attach the Left Hand and Right-Hand Temporary Braces as shown, below. These braces are designed to keep

the assembly as a ONE_PIECE ASSEMBLY during the installation process. These temporary braces will prevent the Left
Hand and Right-Hand Surround Legs from closing fully. This is normal

10. The Surround Parts are now attached together and the assembly is ready to be attached to the fireplace

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11. Before attaching Surround Assembly to the fireplace, remove the Hearth Pad Spacer that is secured to the Floor Plate of the

Fireplace. Remove the two ¼” Hex Head Screws that secure the Hearth Pad Spacer to the Fireplace and slide it out and
discard.

12. Identify the Top Center Clip, Side Attachment Brackets and the #8-32 Studs located on the backside of the Surround

Assembly.

13. Thread one 8-32 nut on each of the three 8-32 studs attached to the Surround Bottom. Thread the nuts in only about 1/8”

and leave loose.

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14. Carefully, stand the Surround Assembly upright. Slide the three (3) studs [attached to the Surround Bottom] into the three

open slots in the fireplace floor plate’s front flange. Do not tighten the nuts at this time.

15. Rotate entire Surround Assembly in towards the fireplace.

16. Make certain that the Side Attachment Brackets slide in between the Outer Skin and the inner heat shield in the fireplace.

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17. Make certain that TOP CENTER CLIP on the back of the Surround Top slides under the inner shield of the fireplace.

18. Loosely secure SIDE ATTACHMENT BRACKETS [part of Surround Top] to unit through slots located in left and right sides

of top surround, see Figure below. Leave screws loose to allow for adjustment and alignment of sur-round.

19. Drive one Sheet Metal Screw upward through the slot in the TOP CENTER CLIP [on the back of Surround Top] in-to the

hole located in the INNER SHIELD TOP. Leave screw loose for adjustment.

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20. Remove and discard the Left Hand and Right-Hand Temporary Braces.

Adjustment and Alignment Instructions for

Surround

1. Rotate left hand and Right-Hand Surround Legs closed. Check

alignment of Left-Hand Surround Leg and Right-Hand Sur­round Leg to Surround Top and Surround Bottom. This
Surround Kit is SELF ALIGNING. Only a slight left to right
adjustment needs to be made to make certain that the gaps
between the Surround Top and the Surround Legs are equal
on both the left and right sides.

2. Open Left- and Right-Hand Surround Legs. Hold Surround Top

in its final position and tighten the three loosely attached
Sheet Metal Screws to secure the surround kit to the unit
.

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4.16 LIGHTING CHECKLIST

Be sure to check these items before final operation of the Fireplace.

☐ All items on "Installation Checklist" must be completed.
☐ Carefully follow all lighting and log installation instructions. Make certain that pilot flame lights immediately and lights both

front and rear burners.

☐ Check for Gas leaks and gas pressures prior to installing facing materials.
☐ Follow “First-Time Lighting Instructions” to synchronize the remote control and the ignition module.
☐ Air shutter opening 0" to ⅛" for natural gas or ¼” to fully open for LP gas is checked.
☐ All lighting and log installation instructions were followed.
☐ Burners lights immediately and flame runs promptly around rear burner and lights entire burner.

Note: Do not proceed with operation unless burner cycles "on/off" without delays.

☐ Flame is "stable" and does not "lift" off burner after 5 minutes of startup. If flame still lifts off burner after 5 minutes,

turn unit off and check that all vent pipes are "twist locked" and leak proof, the vent cap is "right side up”. Do not
proceed with operation if flame is "lifting off" burner.

☐ DO NOT proceed with operation unless burner cycles "on/off" without delays and the flame is "stable" and not "lifting" off

burner after 5 minutes of initial ignition.

Caution: If ignition system goes into lockout mode, be sure to wait a minimum of five minutes before
attempting to relighting.

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4.17 AIR SHUTTER CONTROL AND FLAME APPEARANCE

During initial installation, the air shutter opening
should be checked to be certain that the shutter is set
correctly at 1/8" open for natural gas and 1/2"
minimum open for L.P. gas. NOTE: For altitudes above
5,000’, some variations may be required.
Be sure burner and logs are properly installed. After
log set has been properly installed, adjustments to
the air shutter shall be made for final flame
appearance. These small shutter adjustments can be
made by the following procedure:

NOTE : All adjustments to the air shutter
settin g must be made by a qualified installer,
service agency, or the gas supplier. Very
small changes in shutter settings make major
changes in flame appearance.

Two Air Shutter Control Knobs are located behind the
right-side access door. The shutter control knob
located on the top controls the front burner flames. The shutter control knob located on the bottom controls the rear-most
burner flames. After fireplace has warmed up, if flame is too blue, close air shutter in small 1/8" increments until flame turns
desired realistic yellow. Use glass latch tool to hook end and slide control.

1. If flame is causing soot on viewing glass, open air shutter fully until sooting stops. Continue burning unit with air

shutter fully open for four to six hours until all internal deposited soot has burned off.

2. Once deposited soot has disappeared, close air shutter in increments of 1/8”.

LPG Air shutter settings hint: A properly adjusted air shutt er sett ing will yield burner flames that have an
approximate 2” high blue color base. If yellow colo red flames are starting at burner level, air shutter is
clo sed too far and will create soot. If you observe that th e fla me is y ellow startin g very close to or at the
burner surface level, open air shutter. Also, if a log or part o f a log is susp ended and hanging inside a yellow
portion of the flame, soot can form easily on th e p art of the log that is inside the yellow flame area.

IMPORTANT: Try each new shutter setting approx. ½ hr. before mak ing additional changes. NOTE: Changes
in fr ont burner flame can be made by re -arranging the coals and front bur ner air shutter opening.

Figure 4-12 Burner Air Shutter Controls

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HOMEOWNER INFORMATION

Welcome to Mendota. We are proud to be the makers of world-class direct vent fireplaces and fireplace insert. We understand
that a fireplace is a long-term investment, and we are happy you have chosen us to be a part of your family. We are committed
to quality and satisfaction for all Mendota owners. Thank you for choosing a Mendota to be a source of comfort and beauty in
your home.
We have designed this manual to help you enjoy all that your Mendota Fireplace has to offer. You will find tips, operating
instructions, and frequently asked questions to support the features and functions of your Fireplace.
We want you to enjoy your Mendota for years to come. If you have any additional questions regarding operation of your
Fireplace, please contact your Mendota local dealer.

5.1 AESTHETIC CONSIDERATIONS

Burning or static fireplaces are a major aesthetic focus in any room. In addition to offering the most realistic log details,
textures, coloration and the most realistic wood fire options, Mendota also offers a large array of internal firebox lining options
and external decorative options. Visit www.mendotahearth.com and your local Mendota dealer’s show room to view all options
available.

5.2 HEATING PERFORMANCE

Mendota’s high heat output Fireplace will heat a large area of your home. Air movement options for maximizing heat
circulation that can be considered are operating the Fireplace’s convection blowers, continuous operation of central heating
furnace blowers or room ceiling fans. The heat output of the fireplace can be reduced by turning off the Rear Burner and
reducing flame height using the remote control. Blowers can be turned down or turned off to reduce heat distribution.

5.3 IMPORTANT INFORMATION FOR HOMEOWNER

Before you begin operation of your Gas Fireplace Heater, read and familiarize yourself with information provided in the
following chapters of this manual:

Chapter 3.2.6 Normal Surface Temperatures
Chapter 3.1.1 Mendota Fireplace Curing Instructions

85-03-01120 M27 Page 87

5.4 FIRST TIME LIGHTING INSTRUCTIONS

Safety Information

LIGHTING INSTRUCTIONS

IMPORTANT: Be sure all ite ms on "INSTALLATION CHECK OFF LIST" (pg. 39 have b een co mpleted!
CAUTION: If the pilot goes out, be sure to wait a minimum of five minutes before relighting.

BE SURE TO ALWAYS REMOVE THE GL ASS BE FORE RELIGHTING THE PILOT.

ALWAYS LIGHT PILOT WITH GLASS REMOVED!

1 Make sure any gas supply shut-off cocks are open and Thermostat is

"OFF".

2 Push in Gas Cock Dial Slightly and turn clockwise to "OFF". NOTE:

Dial cannot be turned from "PILOT" to "OFF" unless dial is pushed
slightly. DO NOT FORCE!

3 Wait five (5) minutes to allow gas, which may have

accumulated in main burner compartment to escape.
If you smell gas, STOP.T

4 Turn Gas Cock Dial Counterclockwise to "PILOT" position.
5 Depress Gas Cock Dial and push in red Piezo igniter button. Once

pilot ignites, continue depressing dial for about 1/2 minute. If pilot
does not remain ignited, repeat operation allowing a longer period
before releasing Gas Dial.
IMPORTANT: After pilot is lit, system millivolt readings and gas pressure
should be taken by qualified installer.
Pilot flame must register a minimum of 325 millivolt.

6 After pilot is lit and before installing logs, turn Gas Dial to "ON".
7 Push Main Burner ON/OFF switch to “on” position. Burners should light

immediately.

8 If Rear Burner does not light, Push Rear Burner ON/OFF switch to “on”.
9 Push MAIN BURNER ON/OFF SWITCH to ON then OFF to "cycle" the burner

on/off to make certain it ignites promptly and that the flame runs smoothly
around burner curves and promptly lights both burners.

10 With pilot operating, install logs and coals. With logs/coals in place, "cycle"

the burner again to make sure of prompt ignition of burner and that the flame runs smoothly around entire burner and
does not "lift off" burner. NOTE: Logs will produce a strong, acrid odor on initial contact with flames (about 2 hrs.).

11 Reinstall glass front & screen.

12 Push MAIN BURNER ON/OFF SWITCH to ON to turn on burner.

Warning: If you do not
follow these instructions
exactly, a fire or
explosion may result
causing property
damage, personal injury,
and loss of life.

WHAT TO DO IF YOU SMELL GAS
Do not light any appliance.
Do not touch any light switch
Do not use any phone in your building.
Call your gas supplier from a neighbor's phone.
Follow the provider representative's instructions.
If you cannot reach your gas supplier, call the fire
department for assistance.

Figure 5-1 Gas Valve

85-03-01120 M27 Page 88

Main burner should now light IM MEDIATELY and flame should not "lift" off burner after 5 minutes of initial
star tup. If there is any delay in ignition or if fla me is "lifting off" burner after 5 minutes, turn off burner
and carefully check for proper insta llation of logs/coals, vent system and pr oper p ilo t flame impingement on
burner and thermopile. Logs or coals must not block pilot flame or main bu rner flame. Vent system must
be leak proof.
DO NOT PROCEED WITH OPER ATION UNLESS BURNER "CYCLES" ON/OFF WIT HOUT DELAYS!

13 To reduce heat output, turn Hi/Lo Knob counterclockwise to reduce flame height and heat output. Blower speed can also

be turned down to reduce heat distribution.
NEVER “over fire" by increasing BTUH above nameplate specifications.
NEVER turn down (reduce) pilot flame below the minimum 325 millivolts.

14 Open windows for first two hours of operation.

NOTICE: Initial start-up will cau se some N ON-TOXIC "off gassing" of adhesives, bind er s, pa int, etc. Most
nuisa nce odors will be
eliminated after the first 2 hrs. of operation, however, slight amounts may be present during th e first 24
hrs.

5.5 TO TURN OFF GAS TO FIREPLACE

1. Toggle the MAIN BURNER ON/OFF button to OFF.

2. Turn Gas Cock Dial clockwise to "PILOT” then to “OFF” position.

3. Turn off the internal manual shutoff valve in the appliance.

4. Turn OFF the external manual shutoff valve if one was required and supplied by installer and mounted adjacent to fireplace.

5. Turn OFF all electric power to the fireplace if service is to be performed.

85-03-01120 M27 Page 89

5.6 FREQUENTLY ASKED QUESTIONS

What to do if I smell gas?

If you smell gas:

➢ Do not light any appliance.
➢ Do not touch any light switches.
➢ Do not use any phone in your building.
➢ Call your gas supplier from a neighbor's phone.
➢ Follow the provider representative's instructions.
➢ If you cannot reach your gas supplier, call the fire department for assistance.

Where can I find the model and serial numbers?

When requesting service, you will be asked to provide the model number and serial number to your Mendota dealer. This
information will expedite the warranty verification process. The Listing Label contains the model number and serial number for
your particular appliance.

This is an example of your listing
label:

Listing label location: The listing
label is located in the air gap
below the bottom edge of the
glass door frame. It is attached to
a cable and can be pulled out to be
viewed.

Figure 5-2 Listing Label

85-03-01120 M27 Page 90

Can I use my Fireplace during power outages?

During the power outage, the fireplace’s burner will function as well as the flame height adjustment. The fans will not
function.

What maintenance is required?

Required Annual Maintenance

The following procedures must be performed each year by a qualified installer, service agency or the gas supplier.
Note: Any adjustments to burner, pilot or logs must be done by a qualified installer, service agency or the gas supplier.

Recommended steps for yearly maintenance:

1. Clean all lint and dust build-up around the control. Inspect the condition of any wiring under the burner for melting or

damage.

2. Clean pilot light thermocouple, thermopile and sparker rod using emery cloth. Vacuum clean pilot light assembly.

3. Visual check of pilot flames is required. Pilot flame must overlap thermocouple tip and top 3/8” of thermopiler and burner

ignition ports always. Especially for LP gas applications, always verify visible pilot flame length is at least 1" long.

4. Vacuum all burner ports. Be sure the burner ports are "open".

5. Visual check of main burner’s rear and front flames is required.

6. Remove logs and coals and clean away any foreign matter (lint, carbon, etc.) on the burner and logs.

7. Clean under side of the logs for any carbon deposits. Note: Logs should be visually checked for carbon buildup. If carbon

deposits are visible on logs, unit should be turned off and a qualified installer, service agency or the gas supplier
contacted. Be sure logs are re-installed per instructions.

8. Check condition of glass door gasket, gasket must seal tightly over firebox. Inspect gasket along top and sides of glass. If

gasket bulb along top edge or side top areas are discolored to a white color appearance (through the whole thickness of
the gasket bulb in a 3” to 12” long area) and the gasket adhesive in no longer functional to stick to glass, then replace the
gasket.

9. Visually inspect the vent terminal (vent cap) for leaves, twigs and other debris accumulation. Clean if required.

10. Clean door glass..

85-03-01120 M27 Page 91

Periodic Inspection

Follow these steps for periodic inspections:

1. Check to verify that the vent system and vent cap are open and free of blockage.

2. Before re-installing glass, have qualified service person check the operation of the pilot and cycle the burner per lighting

instructions. Be sure all items in lighting and installation checklists are completed.

3. Periodic visual check of pilot flames is required. Pilot flame must overlap thermocouple, thermopile and burner ignition

ports always. Especially for LP gas applications, always verify visible pilot flame length is at least 1" long (typically, it
should be 1-1/2” long).

4. Periodic visual check of main burner’s rear and front flames is required.

How do I clean the viewing glass?

The viewing glass should be cleaned periodically. Exterior glass surface may be cleaned with cleaner as desired. To clean interior
glass surface, use Kel Kem Polish Plus (part # 65-06-00455) or a comparable product. Caution: Do not use oven cleaner to clean
glass. Clean the glass only when it has cooled to room temperature.

Additives that are put in gas (both natural and p ropane) to make it smell can be harmful to glass and can
lea ve a white fi lm deposit on the glass. This deposit can be removed , if cleaned in a timely manner, with
cleaners such as KEL KEM “Polish Plus” (part # 65 -06-0 04 55) or co mpar able product (contact your dealer).

Is my flame performance correct?

Your fireplace has air shutters, dampers, coals, and embers that can be adjusted depending on your fuel and venting
configuration. These adjustments should be made by a qualified technician to achieve the best flame performance. Contact your
installer or Mendota dealer if you feel your fireplace is not burning correctly. Improper setup and adjustment is not covered
under warranty.

What should I do if my fireplace is sooting?

Sooting is caused by improper installation or air shutter operation. However, some small areas of soot deposits on log surfaces
are deemed acceptable. If you observe large soot areas (larger than 1”x1”) on log surfaces or signs of sooting on the door glass
(usually a thin black film on the Fireplace viewing glass or on the outside of the home around the vent cap), the unit must be
immediately turned off and the local Mendota dealer promptly informed. Mendota dealers will correct "sooting" problems, but
Mendota and their dealers are not responsible for damage caused by excessive sooting that has not been immediately brought
to their attention. Troubleshooting soot:

Issue:
Thin black
coating (soot)
forms on
viewing glass.

Possible Causes:

A. Burner Air Shutter closed too

much.

B. Exhaust Damper is closed too

much.

C. Improper log and/or ember

placement

D. Glass door seal is

compromised.

E. Incorrect gas pressure or

burner orifice size.

Corrective Action:
Open air shutter on burner fully. Check exhaust damper position.
It may be closed too far. Open exhaust damper. Check glass gasket
for proper seal. Corners of glass gaskets cannot be bulging out. If
glass gasket along top edge in the middle is white in color across
entire thickness of gasket bulb and gasket adhesive is not
functional, replace glass gasket. If sooting continues, shut off unit
and call Mendota service person. Have service person check for
proper Orifice Sizes and correct gas outlet pressure (3.5" W.C. Nat.
Gas; 10" W.C. LP Gas).
NOTE: To clean glass - remove glass and wipe glass with cloth or
paper towel.

What happens when I first light my fireplace?

When you first light your fireplace, the initial curing phase is initiated. During the initial curing phase, a small amount of smoke
and odor will be emitted. This is normal. To complete the curing process, run your fireplace, on high fire, for two hours with the
fans on level 3. Open doors and windows to dissipate any odor. Turn your fireplace off. After it has cooled, run it again, on high
fire, with the blowers off until no smoking or odor remains. Refer to Chapter 3.1.1 Mendota Fireplace Curing Instructions for
more information.

85-03-01120 M27 Page 92

MAINTENANCE INFORMATION

6.1 REQUIRED PERIODIC INSPECTIONS

1. Check to verify that the vent system and vent cap are open and free of blockage.

2. Have qualified service person check the operation of the pilot light. Pilot light must light within the first five to eight

seconds of ignitor sparks initiation. If it takes more ten seconds to ignite the pilot flame, check pilot spark rod position and
ignitor wires for pinched areas or damaged areas.

3. Periodic visual check of pilot flames is required. Pilot

Flame must overlap thermocouple tip and burner ignition
ports always. Especially for LPG applications, always verify
visible pilot flame length is at least 1" long, minimum.

4. Cycle the burners to make certain burner ignition is

prompt and flame propagation along burner length is
quick and smooth. If flame propagation is delayed,
remove obstructing debris, vacuum burner ports and
retry.

5. Periodic visual check of rear and front burner flames

pattern is required.

6.2 CLEANING VIEWING GLASS

WARN ING: Do not clean when glass is hot.

The viewing glass should be cleaned periodically. Exterior
glass surface may be cleaned with cleaner as desired. To
clean Interior glass surface, remove glass frame assembly. See 4.8 To Remove Door. Use Kel Kem “polish plus" (part # 65­06-00455) or comparable product to clean glass interior surface. Do not use oven cleaner or abrasive cleaners to clean
glass.

6.3 REQUIRED ANNUAL MAINTENANCE

See Chapter 5.6.4 What maintenance is required?
In addition to the “Required Periodic Inspections”, the following pro cedures m ust be performed eac h year by
a qualified installer, service agency or the gas supplier. Any adju st ments to burner, pilot or logs must be

done by a qualified installer, service agency, or th e ga s supplier.
Clean all lint and dust build-up around the control and blowers. Inspect the condition of any wiring under the burner for melting

or damage. Clean thermocouple and thermopile tips using emery cloth. Vacuum all burner ports and pilot assembly.
Remove logs & coals and clean away any foreign matter (lint, Carbon, etc.) on the burner and logs. Be sure the burner ports are
"open". Clean the pilot and under side of the logs for any Carbon deposits.

NOTE : Logs should be visually checked for Carbon "build-up". If heavy carbon deposits are visible on logs,
unit should be turned off and a qualified installer, service agency, or the ga s supplier should be contacted.
Be su re log s are re-installed per instruction s.

Check glass gasket seal. Visually inspect glass gasket, especially at the corners of the glass piece. Glass gasket is installed as a 4­piece assembly. Check joints between the gasket pieces at the corners. They should butt against each other to create a seal. Gaps
between gasket pieces can cause exhaust leaks and lead to acrid smell concerns.

Figure 6-1 Minimum Pilot Flame Length

85-03-01120 M27 Page 93

6.4 OVER FIRING OR UNDER FIRING OF BURNER

NEVER "over fire" or “under-fire” units by increasing or decreasing the main orifice sizes or by adjusting gas pressure to increase
BTUH above nameplate specifications.

Over fi rin g can cause permanent damage to firebox and deterioration o f pa rts and void the warranty.
Under-firing can potentially cause delayed ignition and lead to property loss and person injury and will void the warranty.

If you a re using a “backyard” Natural Gas well as t he ga s so urce, you must submit formal gas analysis data

sh eet s to Mendota Fireplaces for review and calculation of prop er main burner orifice sizes prior to first
fir ing. It is known that unpurified Natur al Ga s fro m “backyard” wells can contain high energy levels ca usin g
over firing. Further, unpurified gas can contain high levels of Sulphur and other compounds which can
damage the burner materials and the ceramic gla ss. Use o f unpur if ied ga s will void the warranty for this
product.

6.5 PILOT OUTAGE AND RE-LIGHTING

If pi lot goes out, be sure to wait a minimum of five minutes b efore attempting to re -light. If lockout occurs
frequently, contact you Mendota Dealer for diagnosing th e pr oblem.

Frequent pilot outages can be caused by many factors and must be properly diagnosed, and the primary cause identified. It
should never be assumed that the ignition control system is faulty without proper diagnosis.

6.6 COMBUSTION SYSTEM MILLIVOLT READINGS

Millivolt readings must be taken by a qualified installer at the time of installation and after any interruption in burner operation.
These readings will establish proper thermopile millivolt generation and assure trouble-free burner operation. Readings must be
taken with:

A. Pilot ONLY operating.
B. Main Burner operating.

PILOT ONLY OPERATING

Thermostat "OFF” Minimum Millivolts 325

Using a Millivolt Meter, a millivolt reading should be
taken by attaching Meter leads to terminals #1 and #2 on
the main gas valve. The Meter must read a minimum of
325 millivolts with the Pilot Light operating, Thermo-stat
turned "OFF" and Main Burner "OFF". To increase or
decrease millivolts (and pilot flame) adjust pilot screw on
control (see Error! Reference source not found.). Pilot

Flame must be a minimum of ¾” long on all three

branches.

MAIN BURNER OPERATING

Thermostat "ON" -Minimum Millivolts 100

Using a Millivolt Meter, a millivolt reading
should be taken by attaching Meter leads to
terminals #2 and #3 on the millivolt panel on
the main gas valve. The Meter must read a
minimum of 100 millivolts with the Gas Cock
Dial turned “ON”, Thermostat "ON" and Main
Burner operating. To increase or decrease

millivolts (and pilot flame) adjust pilot

screw on control

CHECK TEST

TO TEST

CONNECT METER

LEADS TO TERMINALS

THERMOSTAT

CONTACTS

METER

READING

SHOULD BE

A

COMPLETE SYSTEM

2 & 3

CLOSED

100MV OR

MORE

B

THERMO-PILE OUTPUT

1 & 2

OPEN

GREATER THAN

325 MV

C

SYSTEM RESISTANCE

1 & 3

CLOSED

LESS THAN

2.8 ohms

D

AUTO/ PILOT DROPOUT

1 & 2

OPEN

BETWEEN

120-30 MV

85-03-01120 M27 Page 94

6.7 BURNER FLAME HEIGHTS REFERENCE DIAGRAM

This image provides a visual reference for the
burner flames burning at maximum height after
the burners have been operating for 30
minutes or longer. A normal rear flame will be 1
to 2 inches above the rear log top edge. This,
however, is dependent on the gas type, air
shutter opening setting and vent system
configuration. Actual flame heights can be
slightly higher or lower when compared to this
reference image.

85-03-01120 M27 Page 95

REPLACEMENT PARTS INFORMATION

How to Access Components

The descriptions below show where the main fireplaces components are located and how to access them for service. The
descriptions show how to access the components after the fireplace has been installed. All components are also accessible from
the outside of the unit before the fireplace is installed.

Pilot: The pilot is on the right side of the firebox where the rear and front burner ends come together.
Gas Valve: The main gas valve is located behind the left side surround hinged door. Open the left side surround hinged door to

inspect the gas valve, wiring, and gas inlet connections.
Complete Valve Assembly: To make working on components easier, this fireplace has been designed with the valve, pilot,

shutter boxes, shutter cables and gas lines as part of one assembly that can be removed from the fireplace. To remove the
assembly first remove the inspection panel. This will allow the main gas inlet and wires to the valve, rear burner solenoid and
pilot to be disconnected. After disconnecting the gas line and wires remove the screws from the valve mounting plate (13 on the
left side and two on the floor of the firebox). Then remove the entire assembly from the firebox.

Convection Blowers: The convection blowers are mounted behind the rear wall of the of firebox. To access the convection
blowers, it is necessary to remove firebox liner, logs, burner system and burner airbox and an access cover plate in the firebox
floor. Convection blowers control rheostat is mounted behind hinged right-side surround leg.

Convection Air Blower System Parts

Item 1

15-02-00120

BLOWER, RH

Item 2

15-02-00121

BLOWER, LH

Figure 7-1 M27 BLOWER ASSEMBLIES

85-03-01120 M27 Page 96

Gas Train Replacement Parts List

ITEM

PART NO

DESCRIPTION

ITEM

PART NO

DESCRIPTION

1

05-02-00313

VALVE, SIT, NATURAL GAS, 225F, 3.5-1.3

15

60-05-00049

ELBOW, STREET, 1/2 MPT/ 1/2 FPT, BLACK

2

05-02-00310

VALVE, SOLENOID

16

05-02-00289

NG PRESSURE REGULATOR (3.5-1.3”WC)

3

05-04-00039

PILOT ASSEMBLY, M27

17

65-06-00987

BATTERY, 9V ALKALINE

4

65-07-00010

BCF, 3/8 TBE X 1/8MPT COMP ELBOW-AF

18

05-02-00283

EXTENSION, SHORT KNOB, ON/OFF

5

65-07-00060

BCF, 3/8" X 3/8" X 1/4" MALE

19

65-06-01064

SPARK IGNITER, PIEZO

6

65-07-00009

BCF, 3/8 TUBE X 1/4 MPT COMP

20

10-10-00104

SWITCH, ROCKER #1A822 BLK.

7

65-06-01062

CABLE, AIR SHUTTER W/SET COLLAR, 30in

21

10-03-00072

SKYTECH WIRE HARNESS W/ SWITCH

8

65-06-00954

CABLE, AIR SHUTTER W/SET COLLAR

22

10-01-00047

KNOB, BLACK #1260331

9

HA-48-00021

EXTENSION, SHUTOFF, ASSEMBLY, M27

23

05-02-00284

EXTENSION, SHORT KNOB, HI/LO

11

65-14-00045

ORIFICE, #45 NAT [ #56 LPG]

24

05-02-00315

LP PRESSURE REGULATOR (10”-3.3”WC)

12

65-14-00051

ORIFICE, #51 [#59 LPG]

25

05-07-00075

THERMOCOUPLE, M27

13

65-07-00744

VALVE, BALL 1/2FPT X 3/8 FLARE

26

05-07-00076

THERMOPILE, M27

14

65-07-00748

SWIVEL CONNECTOR, SAE-F SWIVEL TO NPT­M, 6-6 F6X-S

85-03-01120 M27 Page 97

Glass Frame Parts Replacement Procedure

WARN ING: do not use substitute materials. All replacement mat erials must be certified and obtained through
Mendota fireplaces.

TO REPLACE DAMAGED GLASS

1. Bend glass retainer tabs up 90 degrees. Four tabs hold down the glass and gasket assembly.

2. Remove the damaged glass and gasket material. Clean the inner surface of the glass frame.

3. Assemble new gasket on glass edge starting with the bottom left corner. The adhesive on the gasket should contact the

glass surface. Use tracer lines in gasket to determine where the glass should sit on the gasket surface.

4. Place glass and gasket assembly in glass frame and carefully bend down glass retainer tabs. Extra glass retainer tabs are

provided should any originally used tabs break off.
The glass frame assembly and its individual components are available through Johnson Gas Appliance Company. Contact your
dealer for more detailed ordering information.

GLASS FRAME ASSEMBLY # HA-48-00103

REPLACEMENT PARTS LIST

ITEM

PART NUMBER

DESCRIPTION

1

HA-48-00002

FRAME, WELDMENT, GLASS, M27

2

65-02-00103

GASKET, TADPOLE, 3/8”BULB, 3/4”

TAIL

3

65-06-01063

GLASS, CERAMIC, M27

85-03-01120 M27 Page 98

WARRANTY QUALIFICATION AND SERVICE

The following information verifies proper installation and operation of your Mendota fireplace. All installation and operating
instructions must be carefully followed. This Mendota fireplace must be installed and serviced by a qualified installer, service
agency, or the gas supplier.

8.1 FINAL INSTALLATION AND HOMEOWNER CHECKLIST

❑ INSERTS ONLY: The existing woodburning fireplace and its chimney system are structurally sound, professionally cleaned,

intact and remain woodburning capable (inserts only).

❑ INSERTS ONLY: Woodburning chimney interior and chimney top cap are inspected and repaired or replaced if damaged.
❑ No offensive odor emitting materials exist around appliance such as low temp rated adhesives, plastics or others.
❑ All surrounding finishing materials are conforming to manual requirements.
❑ Electrical power supply system conforms to NEC and local electrical codes.
❑ Gas supply must conform to national and local building codes.
❑ All gas line joints were checked for leaks using gas leak detector solution or a gas sniffer.
❑ All internal gas plumbing joints were checked for leaks using gas leak detector solution or a gas sniffer.
❑ Glass gasket was inspected and verified that it is sealing properly.
❑ Gas supply line was bled of air and pilot flame was ignited.
❑ Pilot flame overlaps burner flame propagation ports properly.
❑ Burners light and flames travel promptly along entire length of burner.
❑ Logs/media are installed properly per installation instructions.
❑ Burner(s) air shutter is adjusted properly. Shutter opening set properly per installation manual.
❑ Burner flames are “stable” and are not “lifting” off burner.
❑ Inform owner that an initial curing step is required. Read and follow Mendota Fireplace and Insert Curing Instructions

(found on unit and in owner’s manual). Smoke will emit during initial curing step.

❑ Provide owner with contents of owner’s manual packet.

• Owner’s manuals, remote control transmitter, glass latch tool, backup battery system, etc.

❑ Train owner how to remove and reinstall decorative front.
❑ Train owner how to remove and properly reinstall glass door.
❑ Inform owner about the glass safety screen barrier requirement.
❑ Train owner on remote control functions.

• Inform owner about IPI and CPI mode and that CPI shall be used for winter months.

• How to light the pilot light.

• How to light the main burners and how to control the flame height.

• How to turn the fan on and how to control fan speed.

• How to turn light on and how to control light brightness.

• How to turn the rear burner on and off.

• Explain manual mode operation.

• Explain thermostatic modes operations.

❑ Train owner about lockout mode and how to reset it.
❑ Train owner how to use backup battery system and operate appliance during power outage.
❑ Train owner about master switch location and emergency shutoff function.
❑ Train owner how to operate manual shutoff gas valve using glass latch tool.
❑ Inform owner that periodic maintenance of this unit is required per manual.

WARNING: MENDOTA GAS FIREPLACES ARE HEAT PRODUCING APPLIANCES. KEEP CHILDREN AND
FURNITURE A SAFE DISTANCE AWAY TO PREVENT PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE.

I have trained and informed homeowner of all the requirements listed above.

Staff Name_______________________________________ Staff Signature Date_________________________________

Homeowner’s Name_______________________________ Homeowner’s Signature Date__________________________

85-03-01120 M27 Page 99

8.2 WARRANTY POLICY STATEMENT

Mendota Fireplace, a division of Johnson Gas Appliance Company, extends this Limited Lifetime Warranty to the original
purchaser of this appliance provided the product remains in the original place of installation. The items covered by this limited
warranty and the period of such coverage is set forth in the table below.

Some conditions apply (see below).
The policy is not transferable, amendable or negotiable under any circumstances.

Description

Lifetime

3 years

Parts Coverage

2 years

1 year

90 days

Firebox and Heat Exchanger

STD

Glass-thermal (breakage only)

STD

Stainless Steel Burner Tubes/Ceramic Burners

STD

All Castings

EXT

STD

Valve Assembly and all gas control components
(Pilot Assembly, Flame Sensor, Spark Electrode,
Pilot Tubing, Orifices, Thermocouple, Thermopile)

EXT

STD

All other Electrical Components
(Ignition Control Boards, Wiring, Switches, Blowers,
Blower Control Module, Battery Pack)

EXT

STD

Venting/Venting Components

EXT

STD

Remote Control Transmitter

EXT

STD

Exterior Painted Finishes

EXT

STD

Exterior Plated Finishes

EXT

STD

Brick Panels and Log Sets
(coloration failures only)

EXT

STD

All Firebox Media
(Glass Beads, Ceramic Stones, Tumbled Marble)

EXT

STD

All hardware

EXT

STD

Mesh/Glass Safety Barriers

EXT

STD

Enamel Panels

STD

Accent Light Bulbs

STD

STD

= Mendota Standard Warranty

EXT

= Mendota Extended Warranty With Registration

85-03-01120 M27 Page 100

8.3 CONDITIONS

Warranty protects against defect in manufacture or Mendota factory assembled components only, unless herein specified

otherwise.

It remains the full responsibility of the owner to operate this appliance within the guidelines provided in the Installation and

Operating Instructions Manual accompanying this appliance. Further, the owner shall bear full responsibility to enforce

clearances to combustibles requirements and cautioning others about hot glass surface and hot metal surfaces.

Owner by operating this appliance accepts that this is a heat producing appliance which has glass and steel parts that are hot

enough to cause severe burns. Owner accepts that this appliance requires close monitoring of children and vulnerable

individuals who are in the vicinity of this appliance when it is in operation. Mendota does not assume or accept any liability

claims for burns or other physical or material damages resulting from touching hot glass surface and hot metal surfaces that

are part of this appliance or other adjacent object such as hearth pads and mantels that may heat up during operation of

this appliance.

Any part(s) found to be defective during the warranty period as outlined above will be repaired or replaced at Mendota’s option

through an accredited distributor, dealer or pre-approved and assigned agent provided that the defective part is returned

to the distributor, dealer or agent for inspection if requested by Mendota. Alternatively, Mendota may at its own discretion

fully discharge all of its obligations under the warranty by refunding the verified purchase price of the product to the

original purchaser. The purchase price must be confirmed by the original Bill of Sale.

The authorized selling dealer, or an alternative authorized Mendota dealer if pre-approved by Mendota, is responsible for all in-

field diagnosis and service work related to all warranty claims. Mendota is not responsible for results or costs of

workmanship of unauthorized Mendota dealers or agents in the negligence of their service work.

At all times Mendota reserves the right to inspect reported complaints on location in the field claimed to be defective prior to

processing or authorizing of any claim. Failure to allow this upon request will void the warranty.

All warranty claims must be submitted by the dealer servicing the claim, including a copy of the Bill of Sale (proof of purchase by

you). All claims must be complete and provide full details as requested by Mendota to receive consideration for evaluation.

Incomplete claims may be rejected.

Unit must be installed according to all manufacturers’ instructions as per the manual by a Mendota authorized dealer, an

authorized dealer technician or an authorized service person only.

All Local and National required codes must be met.
The installer is responsible to ensure the unit is operating as designed at the time of installation.
The original purchaser is responsible for annual maintenance of the unit, as outlined in the owner’s manual. As outlined below,

the warranty may be voided due to problems caused by lack of maintenance.

Repair/replacement parts purchased by the consumer from Mendota after the original coverage has expired on the unit will

carry a 90-day warranty, valid with a receipt only. Any item shown to be defective will be repaired or replaced at our

discretion. No labor coverage is included with these parts

Exclusions

1. This Limited Lifetime Warranty does not extend to paint, rust or corrosion of any kind due to a lack of maintenance or

improper venting, combustion air provision, corrosive chemicals (i.e. chlorine, salt, air, etc.), door or glass gasketing.

2. Discoloration and some minor warping are normal, not a defect and therefore not covered under this warranty. The

installer must insure the unit is burning as per the rating tag at the time of installation. Over-firing (operation above the

listed BTU rating of this unit can cause serious damage and will nullify this warranty.

3. Mendota will not cover the cost of the removal or re-installation of hearths, facing, mantels or other components.

4. This warranty does not cover dealer travel costs for diagnostic or service work. All labor rates paid to authorized dealers

are subsidized, pre-determined rates. Dealers may charge homeowner for travel and additional time beyond their subsidy.

5. Damages to plated surfaces caused by fingerprints, scratches, melted item or other external sources left on plated surfaces

from the use of cleaners other than denatured alcohol is not covered by this warranty.